SEX 



97 



normal form. But the distribution of the dominants 

 and recessives with regard to the sexes was peculiar. 

 The original cross was between a lacticolor female 

 and a normal male. All the F^ moths of both sexes 



Fig. 17. 



Abraxas grossulariata^ the common currant moth, and (on the right) its paler 

 lacticolor variety. 



. were of the normal grossulariata type. The Fj 

 insects were then paired together and gave a 

 generation consisting of 3 normal : i lacticolor. But 

 all the lacticolor were females, and all the males 



Lact. CD 



Lacticolor X Grossulariata 



9 I 6 



Gr.? X Gr.d* X Lact. 9 



Gr.d Lact.9 Gt.6 Gr.d Gr.9 Lact.9 Gr.d' Lact.C? Gr.9 Lact. 9 



were of the normal pattern. It was, however, found 

 possible to obtain the lacticolor male by mating a 

 lacticolor female with the F^ male. The family result- 

 ing from this cross consisted of normal males and 

 normal females, lacticolor males and lacticolor females, 



H 



