446 



T. H. MORGAN AND C. B. BRIDGES 



Vermilion heterozygous for eosin and pink 



When vermilion females are mated to eosin vermilion pink 

 males, the daughters are vermilion heterozygous for eosin and 

 pink. There seems to be some very slight difference in eye color 

 as compared with vermilion, but the difference is not always 

 evident. This last experiment was carried further by back 

 crossing the Fi female with eosin vermilion pink males in order 

 to get in the next generation material for the study of the lighter 

 eye colors. The results show the non-linkage of eosin and pink. 

 The complete data are as follows: 



Vermilion heterozygous for white and pink 



When vermihon females are mated to white vermilion pink 

 males the daughters are vermilion heterozygous for white and 

 pink. There is a distinct slight difference between these females 

 and stock vermilion females or males. The difference is best 



