. Contributions to the genetics of Drosophila melanogaster. Drosophila melanogaster; Heredity; Karyokinesis. THE ORIGIN OF GYNANDROMORPHS. 45 No. 5238. September 23, 1916. C. B. Bridges. Text-figure 28 (diiigram). Parentage.—One of the X chromosomes of the mother carried the genes for vermihon eye-color and for bar eye, the other X the gene for forked bristles. The X chromosome of the father carried the genes for eosiii, vermilion, and forked. Description.—The fly was mainly female, but is exceptionally interesting from the peculiar description of the male parts, which constitute a v(;ry narro
. Contributions to the genetics of Drosophila melanogaster. Drosophila melanogaster; Heredity; Karyokinesis. THE ORIGIN OF GYNANDROMORPHS. 45 No. 5238. September 23, 1916. C. B. Bridges. Text-figure 28 (diiigram). Parentage.—One of the X chromosomes of the mother carried the genes for vermihon eye-color and for bar eye, the other X the gene for forked bristles. The X chromosome of the father carried the genes for eosiii, vermilion, and forked. Description.—The fly was mainly female, but is exceptionally interesting from the peculiar description of the male parts, which constitute a v(;ry narrow stripe running through the middle of the left eye and along the left side of the thorax, including the wing. The left eye was eosin vermilion in color in the male parts and red in the female parts, both above and below the eosin vermilion. These female parts were heterozygous for bar and the red portions above and below were therefore characteristically narrow, while the eosin-vermilion part was not-bar and projected forward, so that the male stripe could be traced forward to the normal margin of the round eye. The male part of the thorax could likewise be traced by means of the forked bristles, of which there were three anterior to the wing, one above, and none below. The wing itself was included in the male region and was smaller and had forked marginal bristles. There was no sex-comb on the left side. Explanation.—An egg containing an X chromosome with the gene for bar was fertilized by the eosin vermilion forked sperm. A maternal X suffered elimination, leaving the eosin vermilion forked X to produce the male parts. B W^ V f W V f No. 2. September, 1917. T. H. Morgan. Text-figure 29 (drawing). Parentage.—The fly appeared in "selected notch" stock in which, in each generation, red-eyed notch females were bred to eosin ruby males. Description.—The right eye was red, the left partly red, partly eosin ruby, with a very irregular boundary-line; other- wise
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