72 



THE ORIGIN OF GYNANDROMORPHS. 



No. X. July 15, 1916. Text-figure 64. 



Parentage. Ancestry unknown. 



Description The head was small and apparently therefore male. The 

 eyes were eosin ruby. Sex-combs were present on both sides. The abdomen 

 was female. This is apparently an antero-posterior mosaic. 



TEXT-FIGURE 61. 



TEXT-FIGURE 62. 



TEXT-FIGURE 63. 



No. 110. December 12, 1915. A. Weinstein. No diagram. 



The mother had the genes for eosin, ruby, and forked in one X chromosome, 

 and the genes for fused in the other. The father was bar. The eyes of the 

 gynandromorph were bar (homozygous or heterozygous?); the wings were 

 abnormal; the abdomen was female, with female genitalia somewhat abnormal. 



DROSOPHILA GYNANDROMORPHS PREVIOUSLY PUBLISHED. 



There are several references to cases where white spots were found in the 

 eyes of Drosophila, sometimes in cases where the gene for white eyes might 

 have been present (Amer. Naturalist, XLVXII, Aug. 1913, p. 509; Morgan, 

 Science, xxxm, Apr. 1911, p. 534). 



No. I. J. S. Dexter, 1912. Biol. Bull. August 1912. 



Parentage. The mother carried the gene for yellow and white in one X 

 and only wild-type genes in the other. 



Description. Although the individual is described as a female, it is more 

 likely that the yellow white right side was male and the wild-type left side 

 female. This female was found to be sterile, which agrees better with the 

 assumption that the right side was male, since mosaics which are entirely or 

 even more than half female usually are fertile. 



Explanations. A yellow white X egg was fertilized by a wild-type X sperm. 

 Elimination of the paternal X occurred. 



