. Cytology, with special reference to the metazoan nucleus. Cells; Cytology. CHROMATIN AND IDIOPLASM 155 though here a complete complement of hereditary substance is bound to be present. This is probably a universal rule in oogenesis (cf. Fig. 22, etc.). Thus Gardiner (1899) calculated that in Polychaents not more than ^^0 part of the chromatin of the germinal vesicle at its most chromatic stage is used up in the formation of the chromosomes of the meiotic divisions. In the sea-urchin Strongylocentrotus, Erdmann (1909) finds that the volume of the chromosomes in the pluteus is only yV of their
. Cytology, with special reference to the metazoan nucleus. Cells; Cytology. CHROMATIN AND IDIOPLASM 155 though here a complete complement of hereditary substance is bound to be present. This is probably a universal rule in oogenesis (cf. Fig. 22, etc.). Thus Gardiner (1899) calculated that in Polychaents not more than ^^0 part of the chromatin of the germinal vesicle at its most chromatic stage is used up in the formation of the chromosomes of the meiotic divisions. In the sea-urchin Strongylocentrotus, Erdmann (1909) finds that the volume of the chromosomes in the pluteus is only yV of their volume in the two-cell stage. Such considerations have led to the hypothesis of two kinds of chromatin—idiochromatin, the essential hereditary substance, or idio- plasma proper, and irophochromatin (see later under chromidia). Prob-. 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 Agar, Wilfred Eade, 1882-. London Macmillan
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectcells, bookyear1920
