100 



MENDELISM 



CHAP. 



sives 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 were of the normal grossu- 

 lariata type. The FI insects were then paired together 



FIG. 17. 



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



variety. 



and gave a generation consisting of 3 normals : i lacti- 

 color. But all the lacticolor were females, and all the 

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

 found possible to obtain the lacticolor male by mating a 



Lacticclor 



9 



Grossulariata 

 (J 



Lact. <? X Gr.9 X Gr.C? X Lact. 9 



Gr.C? Lact? Gr.C? Gr.C? Gr.9 Lact.9 Gr.C? Lact.C? Gr.9 Lact.9 



lacticolor female with the FI male. The family resulting 

 from this cross consisted of normal males and normal 

 females, lacticolor males and lacticolor females, and the 



