DILUTION EFFECTS IN CERTAIN EYE COLORS 



439 



XWv 



Females 

 Males 



886 



1279 



1132 



636 



The numerical results give a measure of the linkage (coupling) 

 between eosin and vermilion. 



Red heterozygous for white and vermilion 



When vermilion females were mated to white males the red 

 daughters were normal in eye color, although heterozygous for 

 the two factors in question : 



Pi 



vermilion 9 X W v 

 white cf X w V 



XWv 



123 



98 



The converse cross gave 94 red females and 83 white males. 



Thus far the red females heterozygous in not more than two 

 factors have been considered. We may now take up two cases 

 in which three factors are involved. 



