THE M I TA TED GENE 



1 )| \',K\\I 



85 



in the case of an all-or-none response of character C: 



In the section on pleiotropy, we have given an example, the 

 vestigial series, corresponding to the second diagram. Other 

 cases of such parallel effects, with or without shift between the 

 characters, are found in genetic literature. Here are a few 

 examples taken from Stern's monograph in table form: 



Table 8 



(Compiled from Stern's Monograph) 



Dichaete Alleles in Drosophila 



+ 

 D< 

 D* 

 D 



Bristles 



Normal 

 Normal 

 Almost normal 

 Absent 



Wings 



Normal 

 Variable 



Spread 

 Spread 



