No. 524] CHROMOSOMES AND HEREDITY 



487 



glx u 



LLX 1 



QL | 



Heterozygous male G 



r _ A Heterozygous female Gl 

 Cross4 | Lact. male L 



More recently Spillman has suggested a simpler ex- 

 planation that avoids in a sense the postulate of repul- 

 sion of femaleness and grossulariata. According to 

 Spillman, if the character for grossulariata be repre- 

 sented by "G" and femaleness by "X," then if G (or 

 L) and X when they meet behave as ordinary allelo- 

 morphs, the results can be accounted for. The next 

 table shows how Spillman's scheme applies to Abraxas. 

 It is apparent that he has further simplified Castle's table 

 by omitting one L whenever it occurs with another G 

 or L. This arrangement avoids the necessity of the as- 

 sumption that femaleness is repelled by X (as on the 

 Bateson-Punnett scheme) because the X that was re- 

 pelled has become the allelomorph of the G- that is pres- 

 ent and allelomorphs are supposed to move to opposite 

 poles. 



