. The germ-cell cycle in animals . Cells. THE P^DOGENETIC FLY, MIASTOR 57 The nuclei present at the four-cell stage occupy rather definite positions and may be numbered for convenience by the Roman numerals I, II, III, and IV, as indicated in Fig. 15. The division from the four- to the eight-cell stage is a very important one, since it is at this time that the primordial. liff >C M p Fig. 16. — Miastor metraloas. Stages in the chromatin-diminution process. (From Kahle, 1908.) germ cell is established. Each of the four nuclei divides by mitosis, but nuclei I, II, and III undergo a chromatin-
. The germ-cell cycle in animals . Cells. THE P^DOGENETIC FLY, MIASTOR 57 The nuclei present at the four-cell stage occupy rather definite positions and may be numbered for convenience by the Roman numerals I, II, III, and IV, as indicated in Fig. 15. The division from the four- to the eight-cell stage is a very important one, since it is at this time that the primordial. liff >C M p Fig. 16. — Miastor metraloas. Stages in the chromatin-diminution process. (From Kahle, 1908.) germ cell is established. Each of the four nuclei divides by mitosis, but nuclei I, II, and III undergo a chromatin-diminution process during which a large part of their chromatin remains in the cyto- plasm when the daughter nuclei reform. The details of such a process are indicated in Fig. 16. Nucleus IV, on the other hand, divides as usual (Fig. 15) and each daughter nucleus receives one-half of its chroma- tin. One of these daughter nuclei becomes embedded in that peculiar mass of cytoplasm at the posterior. 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 Hegner, Robert William, 1880-1942. New York : The Macmillan Company
Size: 1596px × 1565px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectcells, bookyear1914
