. The germ-cell cycle in animals . Cells. Fig. 73. — Rhabditis nigrovenosa. Stages in maturation, fertilization, and cleavage. A. Oogonium with twelve chromosomes. B. Sec- ond miaturation division. Pronucleus and second polar body each with six chromosomes. C. Primary spermatocj'te. D. Division of primary spermatocyte. E. Second spermatocyte division; one chromosome delayed. F. Two spermatozoa each with six chromo- somes. G. Cleavage spindle of egg showing two groups of chromo- somes ; one with six contributed by the egg, the other with five contributed by the sperm. {After Schleip, 1911.). Pl

---

. The germ-cell cycle in animals . Cells. Fig. 73. — Rhabditis nigrovenosa. Stages in maturation, fertilization, and cleavage. A. Oogonium with twelve chromosomes. B. Sec- ond miaturation division. Pronucleus and second polar body each with six chromosomes. C. Primary spermatocj'te. D. Division of primary spermatocyte. E. Second spermatocyte division; one chromosome delayed. F. Two spermatozoa each with six chromo- somes. G. Cleavage spindle of egg showing two groups of chromo- somes ; one with six contributed by the egg, the other with five contributed by the sperm. {After Schleip, 1911.). 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: 1317px × 1897px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookcentury1900, bookdecade1910, booksubjectcells, bookyear1914