. Contributions to the genetics of Drosophila melanogaster. Drosophila melanogaster; Heredity; Karyokinesis. 84 THE ORIGIN OF GYNANDROMORPHS. (3) On the elimination hypothesis (text-fig. 68, 3), an egg with a W fertilized by a sperm (Z-bearing) should produce a female (ZW). This gives no chance to produce a male side (ZZ) by ordinary elimina- tion. If by somatic non-disjunction (ZZ or no Z) it is not evident that the no-Z part would develop, and if it did, why it should be plain. (3a) If an egg with a Z had been fertilized by a Z sperm (text-fig. 68, Sa), a male (ZZ) would result from which, b
. Contributions to the genetics of Drosophila melanogaster. Drosophila melanogaster; Heredity; Karyokinesis. 84 THE ORIGIN OF GYNANDROMORPHS. (3) On the elimination hypothesis (text-fig. 68, 3), an egg with a W fertilized by a sperm (Z-bearing) should produce a female (ZW). This gives no chance to produce a male side (ZZ) by ordinary elimina- tion. If by somatic non-disjunction (ZZ or no Z) it is not evident that the no-Z part would develop, and if it did, why it should be plain. (3a) If an egg with a Z had been fertilized by a Z sperm (text-fig. 68, Sa), a male (ZZ) would result from which, by elimination of a Z chromosome bearing the white gene, would produce female parts that are zebra and male parts that are also zebra, which is contrary to the actual conditions in the gynandromorph. If the other chromosome should be eliminated, viz, the one bearing the zebra gene, then the male part would be zebra and the female part would be plain. It is evident that this case can not be explained in any of these ways, even though it be assumed that the color-factors are carried by the sex chromosomes. And if we do treat the color-factors as sex-. 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 Carnegie Institution of Washington; Morgan, Thomas Hunt, 1866-1945; Bridges, Calvin B. (Calvin Blackman), 1889-1938; Sturtevant, A. H. (Alfred Henry), 1891-1970. Washington, Carnegie Institution of Washington
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectkaryoki, bookyear1919
