. Heredity in relation to evolution and animal breeding, . Heredity. HEEEDITY all other cells of the prothallus are already in tlie reduced condition without any matura- tion divisions. The result of their union in pairs, at fertilization, is the formation of 2 N combinations that germinate into fern-plants. Similarly in the case of a male animal which. Fig. 8. — Diagram showing the chromosome number in the spermatogenesis of ordinary animals (upper Une) and of the wasp (lower line). has developed from a reduced but unfertilized egg, no reduction occurs at the formation of its sperm-cells. In
. Heredity in relation to evolution and animal breeding, . Heredity. HEEEDITY all other cells of the prothallus are already in tlie reduced condition without any matura- tion divisions. The result of their union in pairs, at fertilization, is the formation of 2 N combinations that germinate into fern-plants. Similarly in the case of a male animal which. Fig. 8. — Diagram showing the chromosome number in the spermatogenesis of ordinary animals (upper Une) and of the wasp (lower line). has developed from a reduced but unfertilized egg, no reduction occurs at the formation of its sperm-cells. In an ordinary male animal, one which is in the double or 2N state, the development of the sperms is attended by re- duction to the N condition. In this process there occur two cell-divisions producing from each initial cell four sperms. See Fig, 5, and 24. 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 Castle, William E. (William Ernest), 1867-1962. New York ; London : D. Appleton and Company
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorklondondappl
