. Contributions to the genetics of Drosophila melanogaster. Drosophila melanogaster; Heredity; Karyokinesis. THE ORIGIN OF GYNANDROMORPHS. 31 It is a matter of great interest to find tliat all the ten cases of somatic mutation that we have recorded in Drosophila have been males. The significance of this was not appreciated until the material had been sorted out for other purposes. It probably means that a recessive somatic mutation takes place in the sex chromosome and shows at once in a male in those parts of the body whose cells contain the mutant gene because the male has only one sex chrom
. Contributions to the genetics of Drosophila melanogaster. Drosophila melanogaster; Heredity; Karyokinesis. THE ORIGIN OF GYNANDROMORPHS. 31 It is a matter of great interest to find tliat all the ten cases of somatic mutation that we have recorded in Drosophila have been males. The significance of this was not appreciated until the material had been sorted out for other purposes. It probably means that a recessive somatic mutation takes place in the sex chromosome and shows at once in a male in those parts of the body whose cells contain the mutant gene because the male has only one sex chromosome. Should a reces- sive mutation occur in the X chromosome of a female its effect would not appear in the soma because the normal allelomorph would conceal it. It is interesting to apply this point of view to certain results in Lepi- doptera in which mosaics or gynandromorphs have been recorded that carry in parts of the body characteristics that are known to occur, although rarely, in varieties of sports of the 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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