DILUTION EFFECTS IN CERTAIN EYE COLORS 451 



Vermilin pink heterozygous for eosin 



Vermilion pink females mated to eosin vermilion pink males 

 gave vermilion pink daughters heterozygous for eosin. As stated 

 in the introduction, these females are hghter than the vermilion 

 pink brothers or the stock vermihon pink females. They are 

 of about the intensity of the eosin male, perhaps darker, but 

 with no light rim and different in opacity. 



Pi 



Gametes of Fi 9 X W v p — X w^ v p 

 Gametes ofPicf Xw^vp p 



was white the female behaved as would any of her fully colored sisters, and al- 

 lowing for the known strength of association between vermilion and the white- 

 eosin locus, the expectation is as follows: red, vermilion, pink and vermilion pink 

 classes, each 34; white cf cf^ 68; eosin cf cf 11; eos. verm. + eos. pink cf cT 34; eos. 

 verm, pink c? cf 23. The observed numbers approach as closely as is probable for 

 so few individuals. In Culture II, appeared a white female, and she also behaved 

 as would her fully colored sisters. When mated to a wild male, she gave 117 red 

 9 9 , 51 white c^cf , 39 eos. verm. cfcT and 14 eosin d'd^, where the expectations 

 called for 111 red 9 9, 55 white cf d^, 37 eos. verm, and 18 eosin (fd'. Here we 

 have then a case of a fly which somatically was colorless, yet genetically was colored. 

 In Culture III appeared three white females which, however, were not tested. 

 The mother in Culture V was miniature (sex-linked) as well as white. There 

 appeared one long eosin male and one long white male which were not tested. 

 In Culture VIII appeared one white female which was not tested and one female 

 much lighter than the sisters which proved sterile. There were also two males 

 which were not white like their brothers, but were light in color. Both were ster- 

 ile. In Culture IX appeared a male in color about eosin, but when crossed to 

 vermilion this color did not reappear in F2. In Culture XI appeared another light 

 male which also was sterile. 



