92 MENDELISM CHAP. 



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 a 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 F a 

 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 



Lacticolor X Grossulariata . 



9 



Lactd* X Gr.9 X Gr.d* X Lact. 9 



Lact.9 Gr.dGr.C? Qr.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 X male. The family result- 

 ing from this cross consisted of normal males and 

 normal females, lacticolor males and lacticolor females, 



