DILUTION EFFECTS IN CERTAIN EYE COLORS 461 



Vermilion heterozygous for white seems to be sUghtly diluted. 

 Vermilion heterozygous for white and pink together shows a dis- 

 tinct though slight dilution. 



The eosiri eyed fly, heterozygous for pink or vermilion (in the 

 female) shows no dilution. When heterozygous for both, the 

 eye color is somewhat more variable than eosin. 



The double recessive eye colors heterozygous for other factors 

 may next be considered. 



Thus, eosin pink female heterozygous for vermilion shows dis- 

 tinct and marked dilution. This can only be studied in the 

 female since the male cannot be made heterozygous in vermihon 

 which is sex-linked. 



The eosin vermilion fly heterozygous for pink shows a dilution 

 like that in the last case but both in the male and female. 



The white-eosin female is the same in color as the eosin male. 



The white-eosin female, heterozygous for pink or for vermihon, 

 shows no dilution. When heterozygous both for pink and ver- 

 milion it seems to have an extended lower range of variation in 

 color. 



The vermilion pink female, heterozygous for eosin, is strongly 

 diluted below the color of the vermilion-pink male. The ver- 

 milion-pink female heterozygous for white is still hghter than the 

 female in the last case. 



The white-eosin pink female is the same in color as the eosin- 

 pink male, that is, the eosin pink female, which is darker than 

 the male, is diluted to the level of the male by the substitution 

 of one white for one eosin factor in the female. 



The white-eosin pink female, heterozygous for vermilion, is 

 diluted in the same proportions as the eosin pink heterozygous 

 for vermilion is diluted. The white-eosin vermilion fe7nale, het- 

 erozygous for pink, is diluted in the same proportions as eosin 

 vermilion heterozygous for pink. 



The white-eosin vermilion pink female has the same eye color 

 as the eosin vermilion pink male. 



