. A manual of zoology. Zoology. Fig. 07.—Four stages in the fertilization of Slroii(;ylocfnlrolus lividns (after Kostanecki"). .4, entrance of sperniatozoon; B, turning of sperm nucleus; C, ap]iroach, and D, fusion of egg and sperm nuclei. (In .1 and B only a piart of the egg is shown.) participate in the formation of the cleavage spindle. It shows that of the chromosomes wliich form the equatorial plate exactly one-half are fur- nished b)'the egg-nucleus, the other by the sperm-nucleus. For, c\'en lie- fore the spindle has been formed and the contour of the two nuclei has disappeared, th
. A manual of zoology. Zoology. Fig. 07.—Four stages in the fertilization of Slroii(;ylocfnlrolus lividns (after Kostanecki"). .4, entrance of sperniatozoon; B, turning of sperm nucleus; C, ap]iroach, and D, fusion of egg and sperm nuclei. (In .1 and B only a piart of the egg is shown.) participate in the formation of the cleavage spindle. It shows that of the chromosomes wliich form the equatorial plate exactly one-half are fur- nished b)'the egg-nucleus, the other by the sperm-nucleus. For, c\'en lie- fore the spindle has been formed and the contour of the two nuclei has disappeared, the chromosomes destined for the spindle are completely developed in exactly the same number in each of these (tig. gS).. 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929, ed. and tr. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
