. Contributions to the genetics of Drosophila melanogaster. Drosophila melanogaster; Heredity; Karyokinesis. THE ORIGIN OF GYNANDROMORPHS. 51 Gynandromorphs Roughly "; No. II139. January 12, 1914. C. B. Bridges. Text-figure 37 (diagram). Parentage.—The mother was black (second chromosome), but carried only wild-type genes in her X chromosomes. The father was a bar not-])Iack male. Descriptions.—The fly was heterozygous bar in both eyes and female through- out, except for the external genitalia, which were male (penis), and the coloration of abdomen. Sections showed that
. Contributions to the genetics of Drosophila melanogaster. Drosophila melanogaster; Heredity; Karyokinesis. THE ORIGIN OF GYNANDROMORPHS. 51 Gynandromorphs Roughly "; No. II139. January 12, 1914. C. B. Bridges. Text-figure 37 (diagram). Parentage.—The mother was black (second chromosome), but carried only wild-type genes in her X chromosomes. The father was a bar not-])Iack male. Descriptions.—The fly was heterozygous bar in both eyes and female through- out, except for the external genitalia, which were male (penis), and the coloration of abdomen. Sections showed that a pair of ovaries was present. Explanations.—An egg with a wild-type X was fertilized by the X sperm with the gene for bar. Since the male parts did not involve the eye, it can not be determined whether they arose from cells carrying the bar (paternal) or the wild-tj^e (maternal) X. The fly did not show black in the male parts, but since the male region was so small and also normally dark-colored, this case could not be accepted as proving that the elimination did not aff"ect the autosomes, as is proved in several later cases, especially devised for that purpose. or B B No. 1813. July 5, 1915. C. B. Bridges. Text-figure 38 (diagram). Parentage.—One X chromosome of mother carried the genes for forked and for cleft (wing); the other X only wild-type genes. The father was forked. Descriptions.—The head, thorax, wings, and legs were female. The ab- domen had the male coloration and a normal penis. The (poor) sections. 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
