. The germ-cell cycle in animals . Cells. 266 GERM-CELL CYCLE IN ANIMALS 1910). The eggs laid by the stem-mother (see Chap- ter I, p. 24) in the spring possess four ordinary and C A B. FiQ. 71. — Stages in the spermatogenesis and oogenesis of the honeybee. A, B. First maturation division in the male. C. Second matura- tion division in the male. Three cells are produced : the first (BKi) without chromatin; the second (^^^2) with chromatin, but small and functionless; and the third a functional spermatid. {After Meves, 1907.) D. First maturation division in the female showing polar body with eig
. The germ-cell cycle in animals . Cells. 266 GERM-CELL CYCLE IN ANIMALS 1910). The eggs laid by the stem-mother (see Chap- ter I, p. 24) in the spring possess four ordinary and C A B. FiQ. 71. — Stages in the spermatogenesis and oogenesis of the honeybee. A, B. First maturation division in the male. C. Second matura- tion division in the male. Three cells are produced : the first (BKi) without chromatin; the second (^^^2) with chromatin, but small and functionless; and the third a functional spermatid. {After Meves, 1907.) D. First maturation division in the female showing polar body with eight dyads, and secondary oocyte with eight dyads. E. Sec- ond maturation division in the female showing the divided first polar body, the second polar body, and female pronucleus each with eight monads. F. Outer end of first polar body disintegrating; inner half of first polar body uniting with second polar body, and female pronucleus. {After Nachsheim, 1913.) two sex chromosomes. These eggs give rise to parthenogenetic females with the same number of. 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
