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Total de Resultados: 9

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T7HJ4X Cartoon vector illustration of structure of plant cell. Illustration showing the plant cell anatomy
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T7HJ4Y Cartoon vector illustration of structure of plant cell. Illustration showing the plant cell anatomy
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2AJGX7P The cell in development and inheritance . Fig. 25. — Diagrams showing the prophases of mitosis.A. Resting cell with reticular nucleus and true nucleolus ; at c the attraction-sphere containingtwo centrosomes. B. Early prophase ; the chromatin forming a continuous spireme, nucleolus stillpresent; above, the amphiaster (a). CD. Two different types of later prophases. C. Disappear-ance of the primary spindle, divergence of the centrosomes to opposite poles of the nucleus (exam-ples, some plant-cells, cleavage-stages of many eggs). D. Persistence of the primary spindle (toform in some cases the ce
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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. "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
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RDYCDB . The plant cell, its modifications and vital processes; a manual for students. Plant physiology; Plant anatomy; Plant cells and tissues. 110 THE PLANT CELL.. JFig. 84.—The Embeto-sac of Lilium martagon showing the nucleus of the sac at the phase where the primary chromosomes (split and twisted) have just been formed (late prophase). Three large nucleoli are present (from a photomicrograph).. 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
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RJD4PC . The cell in development and inheritance. Cells. Fig. 19. —Diagrams showing the prophases of mitosis. A Resting-cell with reticular nucleus and true nucleolus; at c the attraction-sphere contain- in'^ two centrosomes. B. Earlv prophase ; the chromatin forming a continuous spireme, nucleolus sti'll present- above, the amphh.ster {a). C. D. 'IVo different types of later prophases; C. Dis- appearance'of the primary spindle, divergence of the centrosomes to opposite poles of the nucleus (examples manv plant-cells, cleavage-stages of many eggs). /.). Persistence of the' primary spindle (to form'in
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RJCX33 . The cell in development and inheritance. Cells. Fig. 25. — Diagrams showing the prophases of mitosis. A. Resting cell with reticular nucleus and true nucleolus ; at c the attraction-sphere containing two centrosomes. D. Early prophase ; the chromatin forming a continuous spireme, nucleolus still present; above, the amphiaster {a). C. D. 'fwo different t-pes of later prophases. C. Disappear- ance of the primary spindle, divergence of the centrosomes to opposite poles of the nucleus (exam- ples, some plant-cells, cleavage-stages of many eggs). D. Persistence of the primary spindle (to form in
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RJD4DE . The cell in development and inheritance. Cells; Cells. Fig. 19. — Diagrams showing the prophases of mitosis. A. Resting-cell with reticular nucleus and true nucleolus; at c the attraction-sphere contain- ing two centrosomes. B. Early prophase; the chromatin forming a continuous spireme, nucleolus still present; above, the amphiaster {a). C. D. Two different types of later prophases; C. Dis- appearance of the primary spindle, divergence of the centrosomes to opposite poles of the nucleus (examples, many plant-cells, cleavage-stages of many eggs). D. Persistence of the primary spindle (to form
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RJD3T3 . The cell in development and inheritance. Cells. Fig. 25.— Diagrams showing the prophases of mitosis. A. Resting cell with reticular nucleus and true nucleolus; at c the attraction-sphere containing two centrosomes. B. Early prophase; the chromatin forming a continuous j/zW;^^, nucleolus still present; above, the amphiaster {a). C. D. Two different types of later prophases. C. Disappear- ance of the primary spindle, divergence of the centrosomes to opposite poles of the nucleus (exam- ples, some plant-cells, cleavage-stages of many eggs). D. Persistence of the primary spindle (to form in some
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Total de Resultados: 9

Página 1 de 1