. The cell in development and inheritance. Cells. I Fig. 120. — Reduction in the spermatogenesis of Ascarts megalocephala, bivalens. [Brauer.] 1 A- G. Successive stages in tVie division of tlie primary spermatocyte. The original reticulum undergoes a very early division of the chromatin-granules which then form a doubly split spireme- thread, 5. This shortens (C), and breaks in two to form the two tetrads (Z) in profile, £• viewed endwise). F. First division to form two secondary spermatocytes, each receiving two dyads. /. Secondary spermatocyte. J. K. The same dividing. L. Two resul
. The cell in development and inheritance. Cells. I Fig. 120. — Reduction in the spermatogenesis of Ascarts megalocephala, bivalens. [Brauer.] 1 A- G. Successive stages in tVie division of tlie primary spermatocyte. The original reticulum undergoes a very early division of the chromatin-granules which then form a doubly split spireme- thread, 5. This shortens (C), and breaks in two to form the two tetrads (Z) in profile, £• viewed endwise). F. First division to form two secondary spermatocytes, each receiving two dyads. /. Secondary spermatocyte. J. K. The same dividing. L. Two resulting spermatids, each with two single chromosomes and a centrosome. great a stimulus to the study of the entire problem that his views deserve special attention. Weismann's interpretation was based on a remarkable paper published by Wilhelm Roux in 1883,^ in which are 1 For division of the spermatogonia see Fig. 55; for the corresponding phenomena in var. univalens see Fig. 148. 2 Vber die Bedeutung der 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
