. The cell in development and inheritance. Cells. B . Fig. 132. — General view of the maturation-divisions in flowering plants. [MOTTIER.] A-C, in the male; D-F, in the female. A. The two secondary spermatocytes (pollen-mother- ' cells) just after the first division {Lilium). B. Final anaphase of second division {Podophyllutn). C. Resulting telophase, which by division of the cytoplasmic mass produces four pollen-grains. D. Embryo-sac after completion of the first nuclear division {Liliinii). E. The same after the second division. F. The upper four cells resulting from the third division {cf.
. The cell in development and inheritance. Cells. B . Fig. 132. — General view of the maturation-divisions in flowering plants. [MOTTIER.] A-C, in the male; D-F, in the female. A. The two secondary spermatocytes (pollen-mother- ' cells) just after the first division {Lilium). B. Final anaphase of second division {Podophyllutn). C. Resulting telophase, which by division of the cytoplasmic mass produces four pollen-grains. D. Embryo-sac after completion of the first nuclear division {Liliinii). E. The same after the second division. F. The upper four cells resulting from the third division {cf. Fig. io6) : o, ovum; /, upper polar cell; s, synergidas. (For further details, see Figs. 133, 134.) 1 Of these three cells one divides to form the " synergidse," the other two divide to form three "antipodal cells" (which like the synergidse finally degenerate) and a " lower polar ; The latter sooner or later conjugates with the " upper polar cell" (the sister-cell of the egg) to form the " secondary embryo-sac-nucleus," by the division of which the endo- sperm-cells arise. Of the whole group of eight cells thus arising only the egg contributes. 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, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectcells, bookyear1911
