. The germ-cell cycle in animals . Cells. Fig. 64. — Behavior of chromosomes during maturation, fertilization, and cleavage of Ancyracanthus ctjstidicola. {From Mulsow, 1913.) A. Spermatogonium with eleven chromosomes. B. First matura- tion (spermatocyte) division. The single chromosome finally joins one group. C. The four spermatids arising from one spermatocyte; two with six chromosomes, and two with five. D. Two sperma- tozoa drawn while alive; one with six chromosomes, and one with five. E. Oogonium with twelve chromosomes. F. Second matura- tion (oocyte) division. The black mass above is
. The germ-cell cycle in animals . Cells. Fig. 64. — Behavior of chromosomes during maturation, fertilization, and cleavage of Ancyracanthus ctjstidicola. {From Mulsow, 1913.) A. Spermatogonium with eleven chromosomes. B. First matura- tion (spermatocyte) division. The single chromosome finally joins one group. C. The four spermatids arising from one spermatocyte; two with six chromosomes, and two with five. D. Two sperma- tozoa drawn while alive; one with six chromosomes, and one with five. E. Oogonium with twelve chromosomes. F. Second matura- tion (oocyte) division. The black mass above is the first polar body; the set of six black chromosomes are those of the second polar body; the six dotted chromosomes are those of the egg. G. Fertilized (male producing) egg; sperm nucleus above with five chromosomes; egg nucleus below with six chromosomes. H. Fertil- ized (female producing) egg; both egg and sperm nuclei with six chromosomes. I. Cleavage stage of male producing egg ; the central cell with nucleus containing eleven chromosomes. J. Cleavage stage of female producing egg ; the lower cell with nucleus contain- (257). 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
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectcells, bookyear1914
