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Meiosis 1 Stock Photos and Images
RF2K30BC1–Scientific Designing of Meiosis 1. The First Stage of Meiosis Process. Colorful Symbols. Vector Illustration.
RF2H70HCK–G2-mitotic-specific cyclin B1 (pink), cyclin-dependent kinase 1 (blue) and cyclin-dependent kinase regulatory subunit 2 (green) with Flavopiridol.
RFW6MW47–Pregnancy fetal foetus development . Embryonic month stage growth month by month cycle from 1 to 9 month to birth. Medical infographic elements
RMW22DBN–Archive image from page 11 of Cytological and genetic studies of. Cytological and genetic studies of sterility in inbred and hybrid maize cytologicalgenet00clar Year: 1942 714 Connecticut Experiment Station Bulletin 405 i l Figure . A. Normal chromosome 1. The arrows mark the approximate limits of the inversion. B. Inverted chromosome 1. C. Outline drawing of synapsis of normal and in- verted homologues at mid-prophase of meiosis. Plant 42G 8-1 (Pedigree 540X4-8). The centromere region in all drawings is indicated by the ligliter open circle. including centromeres are rarely reported (St
RMRDYT31–. Principles of modern biology. Biology. 478 - Heredity and Evolution o / / / ooo»oooo / A A A A A A A 0000000*00000000 ZYGOTE EMBRYONIC DEVELOPMENT 9 O • / o o o • O A o o A A / / / • • • • A A / A •••••••• PRIMORDIAL GERM CELLS OOOOOOOfOOOOOOOO A A • • • • A A A A / TESTIS 1 SPERMATOCYTE t / SPERMATIDS • • SPERM GONIA A A • • • • A A A A OVARY AUXOCYTES GROWTH PERIOD MATURATION DIVISIONS (MEIOSIS) 1 OOCYTE. A POLAR BODIES EGG ZYGOTE Fig. 26-3. History of the germ cells in multicellular animals; germ cells black, somatic cells white. The number of cell divisions is actually
RMPFK9B3–. Cytology, with special reference to the metazoan nucleus. Cells. II MEIOSIS IN THE FEMALE 59 The particular problems raised by the germinal vesicle stage in oogenesis are : (1) The continuity of the chromosomes throughout this period. (2) The relation between the chromosomes and the nucleoli. (3) The connection between the peculiar germinal vesicle stage and the synchronous enormous growth of the cytoplasm of the egg, together with the formation of yolk. (4) Does any comparable stage occur in spermatogenesis ? (1) The Continuity of the Chromosomes The conditions in the germinal vesicle have
RMME6K68–. Die Natürlichen Pflanzenfamilien : nebst ihren Gattungen und wichtigeren Arten, insbesondere den Nutzpflanzen . Fig. 1.57. A Quersclinitt durcli einen Rhizomast von Eelosis gm/anensis Bicli. — S Querschnitt durcli den Blüten- stengel derselben Pfl. — C Querschnitt durch den Blütenstandstiel von Cynomoriiim coccineum L. / Leitbündel, sU SWerenchymstränge, rad Markstrahlen. der Knollen in Verbindung stehenden Stränge nur selten. Bei Meiosis sind 12—20 Bündel ziemlich regelmäßig in 2 Kreisen geordnet (Fig. 157 ß); auch bei Langsdorfßa erscheint die Anordnung wenigstens der Hauptbündel regelmäßi
RF2K4HA99–Scientific Designing of Differences Between Meiosis and Mitosis. Colorful Symbols. Vector Illustration.
RFW6JE7E–Pregnancy fetal foetus development . Embryonic month stage growth month by month cycle from 1 to 9 month to birth. Medical infographic elements
RMW22GW2–Archive image from page 16 of Cytological studies of five interspecific. Cytological studies of five interspecific hybrids of Crepis leontodontoides cytologicalstudi65aver Year: 1930 Fig. 10. Meiosis in F, C. cnpillaris-leontodontoides. a, I—M, eight univalent chromosomes forming an equatorial plate; b, late I—M, eight univalent chromosomes dividing; c, I-A, irregular division of chromosomes; d, I-T, showing 4—1 distribution of univalent chromosomes; e, monad, with micro- cyte, five large, and three small nuclei; /, dyad with three large and six small nuclei. Occasionally a metaphase is foun
RMRJYE5M–. An atlas of the fertilization and karyokinesis of the ovum. Ovum; Fertilization (Biology); Meiosis; Embryology -- Echinodermata. P B 1. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Wilson, Edmund B. (Edmund Beecher), 1856-1939; Leaming, Edward, 1861-1916. New York, London, Pub. for the Columbia university press by Macmillan and co.
RMPFH8R2–. Cytology, with special reference to the metazoan nucleus. Cells. Fig. i6. Meiosis in Lepidosiren (male). (Agar, Q.J.M.S., 1912.) A, P^ing spermatogomal nuc^^^^^ spermatogonia! prophase ; D, daughter plate from a spermatogonia! anaphase ; E, restmg spermatocyte 1., F, zygotene; G, pachytene nucleus. consequence of this, the word synapsis proposed by Moore to cover the whole of that period of meiosis in which syndesis occurs, has been applied by many cytologists to its most conspicuous feature alone—namely, the contraction just described. It has been thoroughly estabhshed, however, that the co
RF2K4HA98–Scientific Designing of Differences Between Meiosis and Mitosis. Colorful Symbols. Vector Illustration.
RMW1RPC5–Archive image from page 74 of Cytology, with special reference to. Cytology, with special reference to the metazoan nucleus cytologywithspec00agar 0 Year: 1920 II MEIOSIS IN THE FEMALE 59 The particular problems raised by the germinal vesicle stage in oogenesis are : (1) The continuity of the chromosomes throughout this period. (2) The relation between the chromosomes and the nucleoli. (3) The connection between the peculiar germinal vesicle stage and the synchronous enormous growth of the cytoplasm of the egg, together with the formation of yolk. (4) Does any comparable stage occur in sperma
RMRD3GTB–. Cytology, with special reference to the metazoan nucleus. Cells. II MEIOSIS IN THE FEMALE 59 The particular problems raised by the germinal vesicle stage in oogenesis are : (1) The continuity of the chromosomes throughout this period. (2) The relation between the chromosomes and the nucleoli. (3) The connection between the peculiar germinal vesicle stage and the synchronous enormous growth of the cytoplasm of the egg, together with the formation of yolk. (4) Does any comparable stage occur in spermatogenesis ? (1) The Continuity of the Chromosomes The conditions in the germinal vesicle have
![. Cytology. Cytology. ^. Figure 7-1. Interpretative Drawing and Photomicrographs of Metaphase Chromosome from Allium Root Tip Showing Nature and Direction of Coil- ing in Sister Chromatids. (From Wilson, G. B. and Coleman, P. G., 1952. "The Ontogeny of Chromosome and Chromonema Spirals. A Re-evaluation," Cytologia, 17. Figs. 1 and 2, Plate IV.) The most complete hypothesis of the torsion school has been ad- vanced by Darlington (1937). In brief, his idea is that a molecular coil through torsion gives rise to an internal coil in the opposite direction, which in meiosis produces the m Stock Photo](https://c8.alamy.com/comp/PFKGKN/cytology-cytology-figure-7-1-interpretative-drawing-and-photomicrographs-of-metaphase-chromosome-from-allium-root-tip-showing-nature-and-direction-of-coil-ing-in-sister-chromatids-from-wilson-g-b-and-coleman-p-g-1952-quotthe-ontogeny-of-chromosome-and-chromonema-spirals-a-re-evaluationquot-cytologia-17-figs-1-and-2-plate-iv-the-most-complete-hypothesis-of-the-torsion-school-has-been-ad-vanced-by-darlington-1937-in-brief-his-idea-is-that-a-molecular-coil-through-torsion-gives-rise-to-an-internal-coil-in-the-opposite-direction-which-in-meiosis-produces-the-m-PFKGKN.jpg ". Cytology. Cytology. ^. Figure 7-1. Interpretative Drawing and Photomicrographs of Metaphase Chromosome from Allium Root Tip Showing Nature and Direction of Coil- ing in Sister Chromatids. (From Wilson, G. B. and Coleman, P. G., 1952. "The Ontogeny of Chromosome and Chromonema Spirals. A Re-evaluation," Cytologia, 17. Figs. 1 and 2, Plate IV.) The most complete hypothesis of the torsion school has been ad- vanced by Darlington (1937). In brief, his idea is that a molecular coil through torsion gives rise to an internal coil in the opposite direction, which in meiosis produces the m Stock Photo")
RMPFKGKN–. Cytology. Cytology. ^. Figure 7-1. Interpretative Drawing and Photomicrographs of Metaphase Chromosome from Allium Root Tip Showing Nature and Direction of Coil- ing in Sister Chromatids. (From Wilson, G. B. and Coleman, P. G., 1952. "The Ontogeny of Chromosome and Chromonema Spirals. A Re-evaluation," Cytologia, 17. Figs. 1 and 2, Plate IV.) The most complete hypothesis of the torsion school has been ad- vanced by Darlington (1937). In brief, his idea is that a molecular coil through torsion gives rise to an internal coil in the opposite direction, which in meiosis produces the m
RF2K4HA97–Scientific Designing of Differences Between Meiosis and Mitosis. Colorful Symbols. Vector Illustration.
RMW1RD31–Archive image from page 53 of Cytology, with special reference to. Cytology, with special reference to the metazoan nucleus cytologywithspec00agar Year: 1920 Fig. i6. Meiosis in Lepidosiren (male). (Agar, Q.J.M.S., 1912.) A, Ping spermatogomal nuc spermatogonia prophase ; D, daughter plate from a spermatogonia anaphase ; E, restmg spermatocyte 1., F, zygotene; G, pachytene nucleus. consequence of this, the word synapsis proposed by Moore to cover the whole of that period of meiosis in which syndesis occurs, has been applied by many cytologists to its most conspicuous feature alone—namely, the
RMRHP5EG–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ORIGIN AND BEHAVIOUR OF CHIASMATA 369 thus ctiiicthystiniis. 2n--28l (Fig. 2), the range is about 20 to 1, i.e., the same as in DrosopJiila inclanogastcr. It is to be noted that the shortest chromosomes are too small to attain the characteristic chromatid breadth of the species. In HyacintJins the complement consists of 10 chromosomes about 5 /* long together with 18 less than 1 ^ long and an average about one-tenth the length of the longer chromosomes. At the first metaphase of meiosis 14 bivalents are regularly found in Hy
RMPFKAMR–. Cytological studies of five interspecific hybrids of Crepis leontodontoides. Karyokinesis; Crepis. Fig. 10. Meiosis in F, C. cnpillaris-leontodontoides. a, I—M, eight univalent chromosomes forming an equatorial plate; b, late I—M, eight univalent chromosomes dividing; c, I-A, irregular division of chromosomes; d, I-T, showing 4—1 distribution of univalent chromosomes; e, monad, with micro- cyte, five large, and three small nuclei; /, dyad with three large and six small nuclei. Occasionally a metaphase is found with the eight chromosomes forming an equatorial plate and undergoing division, as
RF2K4HA6H–Scientific Designing of Differences Between Meiosis and Mitosis. Colorful Symbols. Vector Illustration.
RMT3Y2WA–Archive image from page 259 of Die Natürlichen Pflanzenfamilien nebst. Die Natürlichen Pflanzenfamilien : nebst ihren Gattungen und wichtigeren Arten, insbesondere den Nutzpflanzen dienatrlichenp31engl Year: 1887-1909. Fig. 1.57. A Quersclinitt durcli einen Rhizomast von Eelosis gm/anensis Bicli. — S Querschnitt durcli den Blüten- stengel derselben Pfl. — C Querschnitt durch den Blütenstandstiel von Cynomoriiim coccineum L. / Leitbündel, sU SWerenchymstränge, rad Markstrahlen. der Knollen in Verbindung stehenden Stränge nur selten. Bei Meiosis sind 12—20 Bündel ziemlich regelmäßig in 2 Krei
RMRD2B58–. Cytology, with special reference to the metazoan nucleus. Cells. Fig. i6. Meiosis in Lepidosiren (male). (Agar, Q.J.M.S., 1912.) A, P^ing spermatogomal nuc^^^^^ spermatogonia! prophase ; D, daughter plate from a spermatogonia! anaphase ; E, restmg spermatocyte 1., F, zygotene; G, pachytene nucleus. consequence of this, the word synapsis proposed by Moore to cover the whole of that period of meiosis in which syndesis occurs, has been applied by many cytologists to its most conspicuous feature alone—namely, the contraction just described. It has been thoroughly estabhshed, however, that the co
RMPFK1M7–. Cytological and genetic studies of sterility in inbred and hybrid maize. Sterility in plants; Corn; Corn; Hybrid corn; Hybrid corn. 714 Connecticut Experiment Station Bulletin 405 i l . Figure ^. A. Normal chromosome 1. The arrows mark the approximate limits of the inversion. B. Inverted chromosome 1. C. Outline drawing of synapsis of normal and in- verted homologues at mid-prophase of meiosis. Plant 42G 8-1 (Pedigree 540X4-8). The centromere region in all drawings is indicated by the ligliter open circle. including centromeres are rarely reported (Sturtevant and Beadle 39, p. 189). They may
RF2K4HA9B–Scientific Designing of Meiosis Phases. Germ Cell Division Process. Colorful Symbols. Vector Illustration.
RMRJYE2A–. An atlas of the fertilization and karyokinesis of the ovum. Ovum; Fertilization (Biology); Meiosis; Embryology -- Echinodermata. OVARIAN EGG, BEFORE FORMATIOM OF THE POLAR BODIES (P, 111. OVARIAN EGG, BEFORE FORMATIOM OF THE POLAR BODIES rP, 11.1. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Wilson, Edmund B. (Edmund Beecher), 1856-1939; Leaming, Edward, 1861-1916. New York, London, Pub. for the Columbia university pre
RMPFK93J–. Cytology. Cytology. '^f I / ^7 if'/ ,' '' ^ ^ A â ^ '^^h' 'A-. -t ^ ^ 11 ^ Figure 5-7. Stages of Meiosis in Microsporocytes of Podophyllum: (1) zygotene; (2) pachytene; (3) diplotene; (4) diakinesis; (5) metaphase I; (6) anaphase I; (7) telophase I; (8) prophase II; (9) metaphase II; (10) anaphase II; (11) early telophase II; (12) late telophase II. (Courtesy of Miss N. Gabriele MLihling, Montana State University.) 128 / CHAPTER 5. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these
RF2K4HACM–Scientific Designing of Meiosis Phases. Germ Cell Division Process. Colorful Symbols. Vector Illustration.
RMRJYE2T–. An atlas of the fertilization and karyokinesis of the ovum. Ovum; Fertilization (Biology); Meiosis; Embryology -- Echinodermata. OVARIAN EGG, BEFORE FORMATIOM OF THE POLAR BODIES (P, 111. OVARIAN EGG, BEFORE FORMATIOM OF THE POLAR BODIES rP, 11.1. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Wilson, Edmund B. (Edmund Beecher), 1856-1939; Leaming, Edward, 1861-1916. New York, London, Pub. for the Columbia university pre
![. Cytology. Cytology. ^T^JF*^ j9^ f^^. "9 -r *» ^ ) I 0^ Figure 5-2. Stages of Mitosis in Meristematic Cells of Pisiim: (1) early prophase; (2) mid-prophase; (3) late prophase; (4) prometaphase; (5) metaphase; (6) early anaphase; (7) late anaphase; (8) early telophase; (9) late telophase. MITOSIS AND MEIOSIS / 121. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Wilson, G. B. (George Bernard), 1914-; Morrison, John H. Stock Photo](https://c8.alamy.com/comp/PFK971/cytology-cytology-tjf-j9-f-quot9-r-i-0-figure-5-2-stages-of-mitosis-in-meristematic-cells-of-pisiim-1-early-prophase-2-mid-prophase-3-late-prophase-4-prometaphase-5-metaphase-6-early-anaphase-7-late-anaphase-8-early-telophase-9-late-telophase-mitosis-and-meiosis-121-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illustrations-may-not-perfectly-resemble-the-original-work-wilson-g-b-george-bernard-1914-morrison-john-h-PFK971.jpg ". Cytology. Cytology. ^T^JF*^ j9^ f^^. "9 -r *» ^ ) I 0^ Figure 5-2. Stages of Mitosis in Meristematic Cells of Pisiim: (1) early prophase; (2) mid-prophase; (3) late prophase; (4) prometaphase; (5) metaphase; (6) early anaphase; (7) late anaphase; (8) early telophase; (9) late telophase. MITOSIS AND MEIOSIS / 121. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Wilson, G. B. (George Bernard), 1914-; Morrison, John H. Stock Photo")
RMPFK971–. Cytology. Cytology. ^T^JF*^ j9^ f^^. "9 -r *» ^ ) I 0^ Figure 5-2. Stages of Mitosis in Meristematic Cells of Pisiim: (1) early prophase; (2) mid-prophase; (3) late prophase; (4) prometaphase; (5) metaphase; (6) early anaphase; (7) late anaphase; (8) early telophase; (9) late telophase. MITOSIS AND MEIOSIS / 121. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Wilson, G. B. (George Bernard), 1914-; Morrison, John H.
RF2K0KKFT–Scientific Designing of Meiosis Phases. Germ Cell Division Process. Colorful Symbols. Vector Illustration.
RMRH8N6T–. Botany of the living plant. Botany; Plants. 566 BOTANY OF THE LIVING PLANT Telophase. At the eighth and final stage of the first division {first telophase, Fig. 432, 7) two daughter nuclei are formed and pass into a short resting stage {interphase). Homotype Division. A second division follows quickly in which the centromeres now split ; as a consequence the process closely resembles an ordinary mitosis, the chromo- some-halves passing to opposite poles and thus into different tetraspores (Fig. 432, 8-10). The outstanding points of meiosis are : (1) It involves two nuclear divisions with onl
RF2K4HACG–Scientific Designing of Meiosis Phases. Germ Cell Division Process. Colorful Symbols. Vector Illustration.
![. Cell heredity. Cytogenetics. FIGURE 9.10. Autogamy and conjugation in Paramecium. 1. Animals with one macronucleus and two micronuciei per cell. 2. Each micronucleus undergoes meiosis. Result: eight haploid nuclei. The macro- nucleus begins to degenerate. 3". Seven of the nuclei degenerate, and the eighth wilt divide. 4. In conjugating animals, one member of each pair of remaining nuclei is exchanged. 5. The haploid nuclei fuse to form the new diploid micronucleus, which divides twice, giving rise to two new macronuclei and two micronuciei. 6. At the next cell division, one macro- nucle Stock Photo](https://c8.alamy.com/comp/RJCX3E/cell-heredity-cytogenetics-figure-910-autogamy-and-conjugation-in-paramecium-1-animals-with-one-macronucleus-and-two-micronuciei-per-cell-2-each-micronucleus-undergoes-meiosis-result-eight-haploid-nuclei-the-macro-nucleus-begins-to-degenerate-3quot-seven-of-the-nuclei-degenerate-and-the-eighth-wilt-divide-4-in-conjugating-animals-one-member-of-each-pair-of-remaining-nuclei-is-exchanged-5-the-haploid-nuclei-fuse-to-form-the-new-diploid-micronucleus-which-divides-twice-giving-rise-to-two-new-macronuclei-and-two-micronuciei-6-at-the-next-cell-division-one-macro-nucle-RJCX3E.jpg ". Cell heredity. Cytogenetics. FIGURE 9.10. Autogamy and conjugation in Paramecium. 1. Animals with one macronucleus and two micronuciei per cell. 2. Each micronucleus undergoes meiosis. Result: eight haploid nuclei. The macro- nucleus begins to degenerate. 3". Seven of the nuclei degenerate, and the eighth wilt divide. 4. In conjugating animals, one member of each pair of remaining nuclei is exchanged. 5. The haploid nuclei fuse to form the new diploid micronucleus, which divides twice, giving rise to two new macronuclei and two micronuciei. 6. At the next cell division, one macro- nucle Stock Photo")
RMRJCX3E–. Cell heredity. Cytogenetics. FIGURE 9.10. Autogamy and conjugation in Paramecium. 1. Animals with one macronucleus and two micronuciei per cell. 2. Each micronucleus undergoes meiosis. Result: eight haploid nuclei. The macro- nucleus begins to degenerate. 3". Seven of the nuclei degenerate, and the eighth wilt divide. 4. In conjugating animals, one member of each pair of remaining nuclei is exchanged. 5. The haploid nuclei fuse to form the new diploid micronucleus, which divides twice, giving rise to two new macronuclei and two micronuciei. 6. At the next cell division, one macro- nucle
RF2K30BC2–Scientific Designing of Meiosis Phases. Germ Cell Division Process. Colorful Symbols. Vector Illustration.
![. Cell heredity. Cytogenetics. NONCHROMOSOMAL GENES Autogamy. FIGURE 9.10. Autogamy and conjugation in Paramecium. 1. Animals with one macronucleus and two micronuciei per cell. 2. Each micronucleus undergoes meiosis. Result: eight haploid nuclei. The macro- nucleus begins to degenerate. 3". Seven of the nuclei degenerate, and the eighth wilt divide. 4. In conjugating animals, one member of each pair of remaining nuclei is exchanged. 5. The haploid nuclei fuse to form the new diploid micronucleus, which divides twice, giving rise to two new macronuclei and two micronuciei. 6. At the next Stock Photo](https://c8.alamy.com/comp/RJCX3W/cell-heredity-cytogenetics-nonchromosomal-genes-autogamy-figure-910-autogamy-and-conjugation-in-paramecium-1-animals-with-one-macronucleus-and-two-micronuciei-per-cell-2-each-micronucleus-undergoes-meiosis-result-eight-haploid-nuclei-the-macro-nucleus-begins-to-degenerate-3quot-seven-of-the-nuclei-degenerate-and-the-eighth-wilt-divide-4-in-conjugating-animals-one-member-of-each-pair-of-remaining-nuclei-is-exchanged-5-the-haploid-nuclei-fuse-to-form-the-new-diploid-micronucleus-which-divides-twice-giving-rise-to-two-new-macronuclei-and-two-micronuciei-6-at-the-next-RJCX3W.jpg ". Cell heredity. Cytogenetics. NONCHROMOSOMAL GENES Autogamy. FIGURE 9.10. Autogamy and conjugation in Paramecium. 1. Animals with one macronucleus and two micronuciei per cell. 2. Each micronucleus undergoes meiosis. Result: eight haploid nuclei. The macro- nucleus begins to degenerate. 3". Seven of the nuclei degenerate, and the eighth wilt divide. 4. In conjugating animals, one member of each pair of remaining nuclei is exchanged. 5. The haploid nuclei fuse to form the new diploid micronucleus, which divides twice, giving rise to two new macronuclei and two micronuciei. 6. At the next Stock Photo")
RMRJCX3W–. Cell heredity. Cytogenetics. NONCHROMOSOMAL GENES Autogamy. FIGURE 9.10. Autogamy and conjugation in Paramecium. 1. Animals with one macronucleus and two micronuciei per cell. 2. Each micronucleus undergoes meiosis. Result: eight haploid nuclei. The macro- nucleus begins to degenerate. 3". Seven of the nuclei degenerate, and the eighth wilt divide. 4. In conjugating animals, one member of each pair of remaining nuclei is exchanged. 5. The haploid nuclei fuse to form the new diploid micronucleus, which divides twice, giving rise to two new macronuclei and two micronuciei. 6. At the next
RF2K4HACN–Scientific Designing of Meiosis Phases. Germ Cell Division Process. Colorful Symbols. Vector Illustration.
RMRHKPAF–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 250 F. HIDETAK.A ET AL. Figure 2. Light micrographs of eggs, developing infusoriform embryos, and fully formed infusoriform embryos otDicyema japonicum. Photomicrographs were taken at magnifications of 2000 diameters under an oil-immersion objective. Scale bar = 1(1 fjm. a. An infusorigen (left) and an oocyte undergoing meiosis (nght). The short arrow indicates the first polar body and the long arrows indicate spermatozoa, b. An oocyte undergoing the second meiotic division. The arrow indicates a spermatozoon, c. An oocyte f
RF2K4HACE–Scientific Designing of Meiosis Phases. Germ Cell Division Process. Colorful Symbols. Vector Illustration.
RMRDXY25–. Principles of modern biology. Biology. Fig. 12-1. The familiar fern plant is the sporophyte generation, consisting of exposed leaves (fronds), an underground stem (the rhizome), and the roots. (From The Plant World, by Fuller and Carothers. Holt, Rine- hart and Winston, Inc.) cluster of spore capsules, or sporangia. At higher magnification one can see that each sporangium is a hollow structure, containing numerous spores (Fig. 12-3). While a spo- rangium is ripening, the spores are produced from spore mother cells, or sporocytes. The spore mother cell undergoes meiosis, giving rise to four h
RF2K30BHM–Scientific Designing of Meiosis 2. The Second Stage of Meiosis Process. Colorful Symbols. Vector Illustration.
RMRE7RYN–. Corn smut caused by Ustilago maydis. Corn; Smut diseases. a chlamydospore may contain 2 nuclei. Ehrlich (85) observed binucleate chlamydospores and cytological studies indicated that the 2 nuclei could be either 2 haploid or 2 diploid or one of each. Some chlamydospores give rise to 2 promycelia. From such a spore, monosporidial cultures of 5 dis- tinct types were isolated (55). These could have been the product of a chlamydospore with more than 1 nucleus or the result of mutation. Delayed reduction.—Meiosis in U. maydis does not always occur in a regular manner. Segregation of factors for s
![. Cytology. Cytology. ^. Figure 7-1. Interpretative Drawing and Photomicrographs of Metaphase Chromosome from Allium Root Tip Showing Nature and Direction of Coil- ing in Sister Chromatids. (From Wilson, G. B. and Coleman, P. G., 1952. "The Ontogeny of Chromosome and Chromonema Spirals. A Re-evaluation," Cytologia, 17. Figs. 1 and 2, Plate IV.) The most complete hypothesis of the torsion school has been ad- vanced by Darlington (1937). In brief, his idea is that a molecular coil through torsion gives rise to an internal coil in the opposite direction, which in meiosis produces the m Stock Photo](https://c8.alamy.com/comp/RD2B92/cytology-cytology-figure-7-1-interpretative-drawing-and-photomicrographs-of-metaphase-chromosome-from-allium-root-tip-showing-nature-and-direction-of-coil-ing-in-sister-chromatids-from-wilson-g-b-and-coleman-p-g-1952-quotthe-ontogeny-of-chromosome-and-chromonema-spirals-a-re-evaluationquot-cytologia-17-figs-1-and-2-plate-iv-the-most-complete-hypothesis-of-the-torsion-school-has-been-ad-vanced-by-darlington-1937-in-brief-his-idea-is-that-a-molecular-coil-through-torsion-gives-rise-to-an-internal-coil-in-the-opposite-direction-which-in-meiosis-produces-the-m-RD2B92.jpg ". Cytology. Cytology. ^. Figure 7-1. Interpretative Drawing and Photomicrographs of Metaphase Chromosome from Allium Root Tip Showing Nature and Direction of Coil- ing in Sister Chromatids. (From Wilson, G. B. and Coleman, P. G., 1952. "The Ontogeny of Chromosome and Chromonema Spirals. A Re-evaluation," Cytologia, 17. Figs. 1 and 2, Plate IV.) The most complete hypothesis of the torsion school has been ad- vanced by Darlington (1937). In brief, his idea is that a molecular coil through torsion gives rise to an internal coil in the opposite direction, which in meiosis produces the m Stock Photo")
RMRD2B92–. Cytology. Cytology. ^. Figure 7-1. Interpretative Drawing and Photomicrographs of Metaphase Chromosome from Allium Root Tip Showing Nature and Direction of Coil- ing in Sister Chromatids. (From Wilson, G. B. and Coleman, P. G., 1952. "The Ontogeny of Chromosome and Chromonema Spirals. A Re-evaluation," Cytologia, 17. Figs. 1 and 2, Plate IV.) The most complete hypothesis of the torsion school has been ad- vanced by Darlington (1937). In brief, his idea is that a molecular coil through torsion gives rise to an internal coil in the opposite direction, which in meiosis produces the m
![. Cell heredity. Cytogenetics. 86 CELL HEREDITY At meiosis a hetorozvgote produces gametes which have either one allele or the other. The sperm and eggs of an M /M' heterozygote are either M^' or M^. If these two types are produced in a 1:1 ratio, and if sperm combine with eggs at random, then there are in equal frequencies four possible diploid combinations at fertilization: Parental (Pj) generation Genotype Father M »fN M'"M Mother M^M^ Genotype of gametes Filial (Fi) generation genotypes Average frequency Ratio. (" M^ j ( ^^ ). Please note that these images are extracted from scan Stock Photo](https://c8.alamy.com/comp/RJBEGT/cell-heredity-cytogenetics-86-cell-heredity-at-meiosis-a-hetorozvgote-produces-gametes-which-have-either-one-allele-or-the-other-the-sperm-and-eggs-of-an-m-m-heterozygote-are-either-m-or-m-if-these-two-types-are-produced-in-a-11-ratio-and-if-sperm-combine-with-eggs-at-random-then-there-are-in-equal-frequencies-four-possible-diploid-combinations-at-fertilization-parental-pj-generation-genotype-father-m-fn-mquotm-mother-mm-genotype-of-gametes-filial-fi-generation-genotypes-average-frequency-ratio-quot-m-j-please-note-that-these-images-are-extracted-from-scan-RJBEGT.jpg ". Cell heredity. Cytogenetics. 86 CELL HEREDITY At meiosis a hetorozvgote produces gametes which have either one allele or the other. The sperm and eggs of an M /M' heterozygote are either M^' or M^. If these two types are produced in a 1:1 ratio, and if sperm combine with eggs at random, then there are in equal frequencies four possible diploid combinations at fertilization: Parental (Pj) generation Genotype Father M »fN M'"M Mother M^M^ Genotype of gametes Filial (Fi) generation genotypes Average frequency Ratio. (" M^ j ( ^^ ). Please note that these images are extracted from scan Stock Photo")
RMRJBEGT–. Cell heredity. Cytogenetics. 86 CELL HEREDITY At meiosis a hetorozvgote produces gametes which have either one allele or the other. The sperm and eggs of an M /M' heterozygote are either M^' or M^. If these two types are produced in a 1:1 ratio, and if sperm combine with eggs at random, then there are in equal frequencies four possible diploid combinations at fertilization: Parental (Pj) generation Genotype Father M »fN M'"M Mother M^M^ Genotype of gametes Filial (Fi) generation genotypes Average frequency Ratio. (" M^ j ( ^^ ). Please note that these images are extracted from scan
RMRD2BXM–. Cytological studies of five interspecific hybrids of Crepis leontodontoides. Karyokinesis; Crepis. Fig. 10. Meiosis in F, C. cnpillaris-leontodontoides. a, I—M, eight univalent chromosomes forming an equatorial plate; b, late I—M, eight univalent chromosomes dividing; c, I-A, irregular division of chromosomes; d, I-T, showing 4—1 distribution of univalent chromosomes; e, monad, with micro- cyte, five large, and three small nuclei; /, dyad with three large and six small nuclei. Occasionally a metaphase is found with the eight chromosomes forming an equatorial plate and undergoing division, as
RMRJPBTE–. The Australian zoologist. Zoology; Zoology; Zoology. Fig.. Fig. 3 Fig. 4 FIG. 1 — Cut-out representation of karyotype of diploid (left) and triploid A nobbi FIG. 2 — Photomicrograph of triploid mitotic figure. Bar represents lOu. FIG. 3 — Diakinesis of triploid individual. Most figures of this stage snowed even less organisation. FIG. 4 — Metaphase II of meiosis in triploid A. nobbi. c.f. Fig 2 for appearance of chromosomes. 306 Aust. Zool. 19(3), 1978. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and
RMRD3XN5–. Cytological and genetic studies of sterility in inbred and hybrid maize. Sterility in plants; Corn; Corn; Hybrid corn; Hybrid corn. 714 Connecticut Experiment Station Bulletin 405 i l . Figure ^. A. Normal chromosome 1. The arrows mark the approximate limits of the inversion. B. Inverted chromosome 1. C. Outline drawing of synapsis of normal and in- verted homologues at mid-prophase of meiosis. Plant 42G 8-1 (Pedigree 540X4-8). The centromere region in all drawings is indicated by the ligliter open circle. including centromeres are rarely reported (Sturtevant and Beadle 39, p. 189). They may
RMRHMXFD–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 526 C. OBATA AND S. NEMOTO free of the follicular envelope were prepared by treating isolated ovaries with Ca-free artificial sea water (CaFSW), as previously reported (Nemoto et al., 1980). After several washings with normal sea water (NSW), we treated the isolated oocytes with 106 M 1-methyladenine (1-MeAde; Sigma Chemical Co.) in NSW to induce meiosis (Kanatani, 1969). Spermatozoa were obtained by making several cuts in isolated testes. Methylxanthines such as caffeine (Sigma), theophylline (Wako Pure Chemical Co.), theo
RMRH8N1E–. Botany of the living plant. Botany; Plants. HEREDITY AND VARIATION 5«3 (2) The chromosome number may be doubled in aba behaviour at meiosis. Thus at meiosis in the I, g< m th. Rapkanus x Brassica, the Radish and Cabbage chromosomes cannot j owing to the wide difference in their genie constitution. quenti first metaphase follows an abnormal course, and sometimes all the chromo- somes come to lie in one daughter-cell ; .it th< rod division, two ' t<lvploids arc derived from a single parent species or race ; in their cells, therefore, tin- 1 hromosome com- plements are all similar (Fi
RMRHN4CC–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 578 R. MASUDA AND J. C. DAN. f FIGURE 1. Thick sections at various stages of Epon-embedded ovaries of Anthocidaris crassispina, stained with toluidine blue: a, stage I, January—accessory cells including numerous )bules occupy the ovariole; b, stage II, March—many growing oocytes are attached to the i wall; c, stage III, June—fully grown oocytes complete meiosis ; d, stage IV, August—. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and ap
![. Cytology. Cytology. ^T^JF*^ j9^ f^^. "9 -r *» ^ ) I 0^ Figure 5-2. Stages of Mitosis in Meristematic Cells of Pisiim: (1) early prophase; (2) mid-prophase; (3) late prophase; (4) prometaphase; (5) metaphase; (6) early anaphase; (7) late anaphase; (8) early telophase; (9) late telophase. MITOSIS AND MEIOSIS / 121. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Wilson, G. B. (George Bernard), 1914-; Morrison, John H. Stock Photo](https://c8.alamy.com/comp/RD2XP8/cytology-cytology-tjf-j9-f-quot9-r-i-0-figure-5-2-stages-of-mitosis-in-meristematic-cells-of-pisiim-1-early-prophase-2-mid-prophase-3-late-prophase-4-prometaphase-5-metaphase-6-early-anaphase-7-late-anaphase-8-early-telophase-9-late-telophase-mitosis-and-meiosis-121-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illustrations-may-not-perfectly-resemble-the-original-work-wilson-g-b-george-bernard-1914-morrison-john-h-RD2XP8.jpg ". Cytology. Cytology. ^T^JF*^ j9^ f^^. "9 -r *» ^ ) I 0^ Figure 5-2. Stages of Mitosis in Meristematic Cells of Pisiim: (1) early prophase; (2) mid-prophase; (3) late prophase; (4) prometaphase; (5) metaphase; (6) early anaphase; (7) late anaphase; (8) early telophase; (9) late telophase. MITOSIS AND MEIOSIS / 121. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Wilson, G. B. (George Bernard), 1914-; Morrison, John H. Stock Photo")
RMRD2XP8–. Cytology. Cytology. ^T^JF*^ j9^ f^^. "9 -r *» ^ ) I 0^ Figure 5-2. Stages of Mitosis in Meristematic Cells of Pisiim: (1) early prophase; (2) mid-prophase; (3) late prophase; (4) prometaphase; (5) metaphase; (6) early anaphase; (7) late anaphase; (8) early telophase; (9) late telophase. MITOSIS AND MEIOSIS / 121. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Wilson, G. B. (George Bernard), 1914-; Morrison, John H.
RMRD33EX–. Cytology. Cytology. '^f I / ^7 if'/ ,' '' ^ ^ A â ^ '^^h' 'A-. -t ^ ^ 11 ^ Figure 5-7. Stages of Meiosis in Microsporocytes of Podophyllum: (1) zygotene; (2) pachytene; (3) diplotene; (4) diakinesis; (5) metaphase I; (6) anaphase I; (7) telophase I; (8) prophase II; (9) metaphase II; (10) anaphase II; (11) early telophase II; (12) late telophase II. (Courtesy of Miss N. Gabriele MLihling, Montana State University.) 128 / CHAPTER 5. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these
RMRHNXK1–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 3. FIGURE 1. Anaphase II with adjacent polar body I, from the ostium of an oviduct ligated as close as possible to the anterior end. X 790. FIGURE 2. Section adjacent to that shown in Figure 1. < 790. FIGURE 3. Completed meiosis in an egg from the coelom of an animal with oviducts ligated at the ostia. Three chromosomes of the haploid set of eleven can be seen at the lower left. Portions of polar bodies I and II are visible outside the egg. • 970. FIGURE 4. Two interphase nuclei in an egg from the coelom kept for 40 hours
![. The British fern gazette. Ferns. BRIT. FERN GAZ. 1 0 (2) 1 969 PLATE IV. 4f « * ⢠l â¦* ⢠⢠*. 4 -; »' * J t 4 â » I*. uJ 2? * * *, * â¦â¦ aJ fcr H PLATE IV. Permanent aceto-carmine preparations of first metaphase of meiosis. Magnification x 1000. to face page 74. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Pteridological Society. [s. l. ] British Pteridological Society Stock Photo](https://c8.alamy.com/comp/RH359T/the-british-fern-gazette-ferns-brit-fern-gaz-1-0-2-1-969-plate-iv-4f-l-4-j-t-4-i-uj-2-aj-fcr-h-plate-iv-permanent-aceto-carmine-preparations-of-first-metaphase-of-meiosis-magnification-x-1000-to-face-page-74-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illustrations-may-not-perfectly-resemble-the-original-work-british-pteridological-society-s-l-british-pteridological-society-RH359T.jpg ". The British fern gazette. Ferns. BRIT. FERN GAZ. 1 0 (2) 1 969 PLATE IV. 4f « * ⢠l â¦* ⢠⢠*. 4 -; »' * J t 4 â » I*. uJ 2? * * *, * â¦â¦ aJ fcr H PLATE IV. Permanent aceto-carmine preparations of first metaphase of meiosis. Magnification x 1000. to face page 74. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Pteridological Society. [s. l. ] British Pteridological Society Stock Photo")
RMRH359T–. The British fern gazette. Ferns. BRIT. FERN GAZ. 1 0 (2) 1 969 PLATE IV. 4f « * ⢠l â¦* ⢠⢠*. 4 -; »' * J t 4 â » I*. uJ 2? * * *, * â¦â¦ aJ fcr H PLATE IV. Permanent aceto-carmine preparations of first metaphase of meiosis. Magnification x 1000. to face page 74. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Pteridological Society. [s. l. ] British Pteridological Society
RMRDYWK9–. Principles of modern biology. Biology. Cell Division in Relation to Reproduction - 53 r — H A P L 0 I D S T A G E S (. SPERMATOCYTES IN TESTIS MITOTIC MULTIPLICATION MEIOSIS STARTING. ANAPHASE 2nd MEIOTIC DIVISION 2nd MEIOTIC DIVISION SPERMATIDS METAMORPHOSIS, NUCLEAR CONDENSATION MATURE SPERM Fig. 3-10. Diagram of meiosis as observed in a testis during the production of sperm. Note that the prophase of the first meiotic division differs in several ways from the prophase of an ordinary mitotic division: (1) it en- dures much longer; (2) it is accompanied by considerable cell growth; and (3)
RMRH35PB–. The British fern gazette. Ferns. FIGURES 1-4: explana- tory diagrams to cells illustrated on Plate 1. Bivalents in solid black, univalents in outline; mag- nification x 1000. Fig. 1: Asplenium billotii. Figs 2 & 3: x Asplenophyllitis microdon. Fig. 4: Phyllitis scolopendrium. IB, ID, & figs 2, 3), showing an irregular meiosis, with a rather variable number of bivalents, 32-36, accompanied by 44-36 univalents. The chromosome number is 108, in other words, triploid. The cytology thus clearly confirms that this plant is a hybrid. An interesting and informative feature of the meiotic fig
RMRJ5BW6–. Ciba Foundation colloquia on ageing. Old age; Aging; Animals -- growth & development. Oocytes in Immature and Mature Guinea Pigs Fig. 1. Immature guinea pig. Nest of oocytes showing phases of meiosis, probably pachytene and diplotene. Fig. 2. Pubertal guinea pig. Nest of oocytes showing phases of meiosis, including zygotene. Fig. 3. Mature guinea pig. Nest of oocytes showing phases of meiosis, including apparent zygotens. Fig. 4. Old guinea pig. Nest of oocytes showing phases of meiosis, including apparent zygotene. Fig. 5. Normal oocyte, showing pachytene phase of meiosis. Fig. 6. Three
![. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. RESTING CONDITION PROPHASE - STAG E S PRIMARY SPERMATOCYTE â â¢*â¢*** homologue FROM ONE PARE NT HOMOLOGUE FROM OTHER P4R ENT FIRST M EIOTI C DIVI SION SECONDARV S PE H MATOCT TE OR OOCYTE SECOND Jii^ M E I 0 T I C ^"^C»^ DIVI SION ^. (1^ (m f1^ fit: Fig. 67. Diagrammatic representation of the nuclear changes occiirrmg during meiosis in spermatocyte and oocyte. Six chromosomes, representing three homologous pairs, are used. Observe the effec Stock Photo](https://c8.alamy.com/comp/REFAKE/comparative-embryology-of-the-vertebrates-with-2057-drawings-and-photos-grouped-as-380-illus-vertebrates-embryology-comparative-embryology-resting-condition-prophase-stag-e-s-primary-spermatocyte-homologue-from-one-pare-nt-homologue-from-other-p4r-ent-first-m-eioti-c-divi-sion-secondarv-s-pe-h-matoct-te-or-oocyte-second-jii-m-e-i-0-t-i-c-quotc-divi-sion-1-m-f1-fit-fig-67-diagrammatic-representation-of-the-nuclear-changes-occiirrmg-during-meiosis-in-spermatocyte-and-oocyte-six-chromosomes-representing-three-homologous-pairs-are-used-observe-the-effec-REFAKE.jpg ". Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. RESTING CONDITION PROPHASE - STAG E S PRIMARY SPERMATOCYTE â â¢*â¢*** homologue FROM ONE PARE NT HOMOLOGUE FROM OTHER P4R ENT FIRST M EIOTI C DIVI SION SECONDARV S PE H MATOCT TE OR OOCYTE SECOND Jii^ M E I 0 T I C ^"^C»^ DIVI SION ^. (1^ (m f1^ fit: Fig. 67. Diagrammatic representation of the nuclear changes occiirrmg during meiosis in spermatocyte and oocyte. Six chromosomes, representing three homologous pairs, are used. Observe the effec Stock Photo")
RMREFAKE–. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. RESTING CONDITION PROPHASE - STAG E S PRIMARY SPERMATOCYTE â â¢*â¢*** homologue FROM ONE PARE NT HOMOLOGUE FROM OTHER P4R ENT FIRST M EIOTI C DIVI SION SECONDARV S PE H MATOCT TE OR OOCYTE SECOND Jii^ M E I 0 T I C ^"^C»^ DIVI SION ^. (1^ (m f1^ fit: Fig. 67. Diagrammatic representation of the nuclear changes occiirrmg during meiosis in spermatocyte and oocyte. Six chromosomes, representing three homologous pairs, are used. Observe the effec
RMRHKMGW–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 312 X. GUO AND S. K. ALLEN, JR.. Figure 1. Synapsis and meiosis in eggs from triploid Pacific oysters: A—metaphase I eggs from diploids with 10 bivalents; B—complete synapsis in metaphase I eggs from triploids with 10 trivalents; C—incomplete synapsis in metaphase I eggs from triploids with a mixture of uni-, bi-, and trivalents; D—metaphase 11 in eggs from triploids; E—anaphase II in eggs from triploids; and F—metaphase of the first mitotic division of an embryo from a tnploid (female) x diploid cross. The orcein staining p
RMRHM3MC–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 2. Scanning electron micrographs of Meiosis I. Fixed in picric acid-formaldehyde. A. Short arrow indicates ridge; long arrow indicates incipient polar body. B. Note reticulating folds on surface of incipient polar body. Figure 1. Semi-thin sections of Meiosis I. A. Late anaphase. Star indicates pit at animal pole. Y indicates yolk platelet. Fixed in picric acid-formaldehyde; stained with azure B and fast green FCF. B. Late telophase. Fixed in picric acid-formaldehyde; stained with azure B. C. First polar body (at arro
RMRHGKMP–. Boletin de la Sociedad de BiologÃ-a de Concepción. Sociedad de BiologÃ-a de Concepción; Biology; Biology. xâ^ Fig. 1.âEstadios de la meiosis en células gonádicas del macho de Aucacris eumera Hebard (Orthoptera, Acrididae, Omexechinae). A.â Paquiteno. B.â Diplo- teno medio. Câ Diploteno final. D.â Diacinesis. E-F.â Metafase I. G.âProfase II. H.âMetafase II. â 290- -f. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Soc
![. [Miscellaneous reprints on botany]. Botany. I m^^ti ^ •^••» •^%) %f^. %o (9 • ' f g /i Fig. 1. Fig. 1. Meiosis in Dahlia Merckii. (2n=36) a. mid-diakinesis. 6. late diakenesis (bivalents at top focus shown in black, mid- dle focus stippled, bottom focus in outline), c. pro-metaphase. d. side-view MI (incomplete) showing secondary association of bivalents. e. association of 3 bivalents of similar configuration, f-j. polar views MI, showing association of bivalents in twos and threes. y= maximum association (2 groups of 3 bivalents & 6 groups of 2 bivalents). Me iap/iase An outstanding fea Stock Photo](https://c8.alamy.com/comp/RDWKX7/miscellaneous-reprints-on-botany-botany-i-mti-f-o-9-f-g-i-fig-1-fig-1-meiosis-in-dahlia-merckii-2n=36-a-mid-diakinesis-6-late-diakenesis-bivalents-at-top-focus-shown-in-black-mid-dle-focus-stippled-bottom-focus-in-outline-c-pro-metaphase-d-side-view-mi-incomplete-showing-secondary-association-of-bivalents-e-association-of-3-bivalents-of-similar-configuration-f-j-polar-views-mi-showing-association-of-bivalents-in-twos-and-threes-y=-maximum-association-2-groups-of-3-bivalents-amp-6-groups-of-2-bivalents-me-iapiase-an-outstanding-fea-RDWKX7.jpg ". [Miscellaneous reprints on botany]. Botany. I m^^ti ^ •^••» •^%) %f^. %o (9 • ' f g /i Fig. 1. Fig. 1. Meiosis in Dahlia Merckii. (2n=36) a. mid-diakinesis. 6. late diakenesis (bivalents at top focus shown in black, mid- dle focus stippled, bottom focus in outline), c. pro-metaphase. d. side-view MI (incomplete) showing secondary association of bivalents. e. association of 3 bivalents of similar configuration, f-j. polar views MI, showing association of bivalents in twos and threes. y= maximum association (2 groups of 3 bivalents & 6 groups of 2 bivalents). Me iap/iase An outstanding fea Stock Photo")
RMRDWKX7–. [Miscellaneous reprints on botany]. Botany. I m^^ti ^ •^••» •^%) %f^. %o (9 • ' f g /i Fig. 1. Fig. 1. Meiosis in Dahlia Merckii. (2n=36) a. mid-diakinesis. 6. late diakenesis (bivalents at top focus shown in black, mid- dle focus stippled, bottom focus in outline), c. pro-metaphase. d. side-view MI (incomplete) showing secondary association of bivalents. e. association of 3 bivalents of similar configuration, f-j. polar views MI, showing association of bivalents in twos and threes. y= maximum association (2 groups of 3 bivalents & 6 groups of 2 bivalents). Me iap/iase An outstanding fea
![. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SEA URCHIN REPRODUCTIVE CYCLE 581 J J A S ONDJ'FMAMJ 30 20 X c a :O 6 i 1 1 1 r. 25 03 20 OJ 15 f5 10 £ " 4: ^ 03 OO J A S 0 N D F M A M • • Anthocidans crassispina. • • Hemicentrotus pulchernmuS FIGURE 3. The gonad index (gonad wet weight/body temperature X 100) and sea surface temperature. Data were taken on the day of collection. grown oocytes. Most of these oocytes complete meiosis during early December, and the mature eggs are stored in the center of each ovariole. The reproductive season (stage IV, Fig. 2d) begi Stock Photo](https://c8.alamy.com/comp/RHN4B2/the-biological-bulletin-biology-zoology-biology-marine-biology-sea-urchin-reproductive-cycle-581-j-j-a-s-ondjfmamj-30-20-x-c-a-o-6-i-1-1-1-r-25-03-20-oj-15-f5-10-quot-4-03-oo-j-a-s-0-n-d-f-m-a-m-anthocidans-crassispina-hemicentrotus-pulchernmus-figure-3-the-gonad-index-gonad-wet-weightbody-temperature-x-100-and-sea-surface-temperature-data-were-taken-on-the-day-of-collection-grown-oocytes-most-of-these-oocytes-complete-meiosis-during-early-december-and-the-mature-eggs-are-stored-in-the-center-of-each-ovariole-the-reproductive-season-stage-iv-fig-2d-begi-RHN4B2.jpg ". The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SEA URCHIN REPRODUCTIVE CYCLE 581 J J A S ONDJ'FMAMJ 30 20 X c a :O 6 i 1 1 1 r. 25 03 20 OJ 15 f5 10 £ " 4: ^ 03 OO J A S 0 N D F M A M • • Anthocidans crassispina. • • Hemicentrotus pulchernmuS FIGURE 3. The gonad index (gonad wet weight/body temperature X 100) and sea surface temperature. Data were taken on the day of collection. grown oocytes. Most of these oocytes complete meiosis during early December, and the mature eggs are stored in the center of each ovariole. The reproductive season (stage IV, Fig. 2d) begi Stock Photo")
RMRHN4B2–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SEA URCHIN REPRODUCTIVE CYCLE 581 J J A S ONDJ'FMAMJ 30 20 X c a :O 6 i 1 1 1 r. 25 03 20 OJ 15 f5 10 £ " 4: ^ 03 OO J A S 0 N D F M A M • • Anthocidans crassispina. • • Hemicentrotus pulchernmuS FIGURE 3. The gonad index (gonad wet weight/body temperature X 100) and sea surface temperature. Data were taken on the day of collection. grown oocytes. Most of these oocytes complete meiosis during early December, and the mature eggs are stored in the center of each ovariole. The reproductive season (stage IV, Fig. 2d) begi
RMRH35BK–. The British fern gazette. Ferns. R1T.FERNGAZ. 10(2) 1969 PLATF I â '-.- * * I 4 -if J * ⢠,* * i« ** *⢠â > v, -4 B ^â¢^. * ⢠-«*? â¢A. **«* y T^ i * â¢: AMi t + +. PLATE II: A: Meiosis in A. adiantum-nigrum ex Kynancs Cove, diakinesis with 72 bivalents. B, C, D, E&F: Meiosis in Asplenium adiantum-nigrum Phyllitis scolopendrium. B, C & D: GV 100:1A. E&F: JDL 1846. B & F: 108 univalents. D: 4 bivalents & 100 univalents. C & E: 6 bivalents & 96 univalents. Magnification / 1000, Leitz N.A. 1.4 2 mm apochromat with X10 eyepiece. to face page 64. Please not
RMRCKCPK–. The elements of genetics. Genetics. Fig. 19.—Meiosis in the egg of the horse thread worm Ascaris megalocephala, a race with two diploid chromosomes. Left: the normal series ending in fusion of single egg and sperm chromosomes. Right: the result of a misorientated first division spindle is the failure of expulsion of the first polar body which fuses with its sister nucleus. The second division leaves a diploid egg which is fertilized to give a triploid embryo. Fusion with a similarly exceptional diploid sperm would give a tetraploid of the race which is indeed found in nature (after Boveri, 1
RMRCHWH9–. Die Natürlichen Pflanzenfamilien : nebst ihren Gattungen und wichtigeren Arten, insbesondere den Nutzpflanzen. Plants; Plants, Useful. Fig. 1.57. A Quersclinitt durcli einen Rhizomast von Eelosis gm/anensis Bicli. — S Querschnitt durcli den Blüten- stengel derselben Pfl. — C Querschnitt durch den Blütenstandstiel von Cynomoriiim coccineum L. / Leitbündel, sU SWerenchymstränge, rad Markstrahlen. der Knollen in Verbindung stehenden Stränge nur selten. Bei Meiosis sind 12—20 Bündel ziemlich regelmäßig in 2 Kreisen geordnet (Fig. 157 ß); auch bei Langsdorfßa erscheint die Anordnung wenigstens de
RMRCHWHC–. Die Natürlichen Pflanzenfamilien : nebst ihren Gattungen und wichtigeren Arten, insbesondere den Nutzpflanzen. Plants; Plants, Useful. Fig. 1.57. A Quersclinitt durcli einen Rhizomast von Eelosis gm/anensis Bicli. — S Querschnitt durcli den Blüten- stengel derselben Pfl. — C Querschnitt durch den Blütenstandstiel von Cynomoriiim coccineum L. / Leitbündel, sU SWerenchymstränge, rad Markstrahlen. der Knollen in Verbindung stehenden Stränge nur selten. Bei Meiosis sind 12—20 Bündel ziemlich regelmäßig in 2 Kreisen geordnet (Fig. 157 ß); auch bei Langsdorfßa erscheint die Anordnung wenigstens de
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