318 



T. H. MORGAN 



TABLE 2 

 Females 



I 



II 



III 



IV 



V 



VI 



VII 



VIII 



IX. 



X. 



WILD TYPE 



VERMILION 



VERMILION 

 PIMK 



128 

 151 

 173 



86 



250 



84 



90 



94 



189 



184 



1428 



123 



154 



169 



89 



231 



84 



93 



96 



228 



188 



1465 



469 



548 



Males 



at least, viz., IV, VIII and X, the sex-ratios were again obtained 

 from F2 females. Further tests were made of the stock derived 

 from the F3 lethal females in order to locate the lethal or lethals 

 present. 



non-disjunction. One of the vermilion females was tested by breeding to a pink 

 male. She gave: 



The two red males are again due to non-disjunction. 



