DILUTION EFFECTS IN CERTAIN EYE COLORS 447 



seen by comparing the Fi females above with their young brothers 

 of the same age; for, as we have seen before, the vermilion male 

 heterozygous for pink is exactly similar to the stock vermilion 

 male: 



Pi 



vermilion 9 XWvP — XWvP 

 white verm, pink cf X w v p — p 



Fi females Fi males 

 XWvP XWvP 

 X w V p p 



vermilion 9 vermilion cf 



200 194 



EOSIN 



Tn the following series of experiments involving eosin direct 

 comparison of the daughters was made with stock eosin females, 

 because of the lighter color of the eosin males. 



Eosin heterozygous for vermilion 



In the experiment on page 439 the eosin female class is hetero- 

 zygous for vermilion and is indistinguishable from the stock eosin. 

 The corresponding eosin male has a constitution identical with 

 that of the stock eosin male and is identical with him in color. 



Eosin heterozygous for vermilion and pink 



Eosin females mated to eosin vermilion pink males gave eosin 

 females of the desired composition and eosin males heterozygous 

 for pink. The analysis is as follows: 



Pi 



THE JOURNAL OF EXPERIMENTAL ZOOLOGY, VOL 15, NO. -1 



