. Contributions to the genetics of Drosophila melanogaster. Drosophila melanogaster; Heredity; Karyokinesis. THE ORIGIN OF GYNANDROMORPHS. 1. red chromosome, and show the corresponding characters, which in fact it does. If the other chromosome had lost one of its halves at the critical division, the male side should be yellow white, which is not the case. Evidently, then, it must have been a yellow white daughter chromosome that was lost in this case. In regard to the five autosomal characters, it is clear that since both male and female sides show all the dominant characters, both sides of th
. Contributions to the genetics of Drosophila melanogaster. Drosophila melanogaster; Heredity; Karyokinesis. THE ORIGIN OF GYNANDROMORPHS. 1. red chromosome, and show the corresponding characters, which in fact it does. If the other chromosome had lost one of its halves at the critical division, the male side should be yellow white, which is not the case. Evidently, then, it must have been a yellow white daughter chromosome that was lost in this case. In regard to the five autosomal characters, it is clear that since both male and female sides show all the dominant characters, both sides of the body received the autosome that bears their genes. This hypothesis thus covers the facts in the case. Sections of the abdomen showed abnormal gonads that appeared to be testes. Another gynandromorph is drawn in plate 1, figure 2. It, too, came from this same cross of a yellow white male by a female of a race with the same five recessive characters. It is not a bilateral. Text-figure 2. gynandromorph, but more nearly an anterior-posterior combination. The abdomen is male, and since the forelegs bear no sex-combs, some at least of the anterior end is female. One wing is male; at least it is shorter than the one on the opposite side, which is presumably female. As in the last case, the fly shows only the characteristics belonging to the normal allelomorphs of the five recessive autosomal factors. The analysis here is the same as above. Another gynandromorph, drawn in text-figure 2, arose from a cross between a male that was heterozygous for the two dominant autosomal genes for star eyes and for dichaete bristles and a female that was notch. 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; Sturte
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectkaryoki, bookyear1919
