SEX-LINKED LETHALS IN DROSOPHILA 



119 



Sterility 



An occasional test was made of the males that were obtained 

 in the high sex-ratio pairs. Thus the sex-ratio from which table 

 1 came was 789 9 to IGcf'd'. Every one of these sixteen males 

 was sterile. (Of their sisters only 13 out of 78 were sterile, or 

 at least gave no offspring). 



w 



w 



X 



w 



w 



X 



u 





Lo 





X 



u 



X 



X 



L3 



La 

 Figure G 



M 



M 



M 



M 



^ ^ 



