. 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 {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
. 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 {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 some cases the " spindle"), fading of the nuclear membrane, ingrowth of the astral ravs segmentation of the spireree-thread to form the chromosomes (examples, epi- d-rmal cells of salamander, formation of the polar bodies). E. Later prophase of tvpe C ; fadmg of the nuclear membrane at the poles, formation of a new spindle inside the nucleus; precocious splitting of the chromosomes (the latter not characteristic of this type alone). I. The mitotic figure established ; The equatorial plate of chromosomes. (Cf. Figs. 16. 21, 24.). 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 Wilson, Edmund B. (Edmund Beecher), 1856-1939. New York : The Macmillan company
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectcells, bookyear1896
