SEX AND SEXUAL CHARACTERS 471 



lacticolor character appears to be coupled with the female sex- 

 character in the female grossulariata and not in the heterozygous 

 male. In the former we may suppose the lacticolor character 

 when it segregates to go into the stronger ova, because of its 

 affinity for the female gamete; while in the latter (or male indivi- 

 dual, all the gametes being spermatozoa) the strong or dominant 

 sperms can carry either lacticolor or grossulariata. 



It is easy to see that my view of the nature of sex and of the 

 relations of the gametes applies equally well to the other cases 

 of sex-limited heredity discussed by Bateson ; namely, that of 

 the pink eye in cinnamon canaries, and of the pigmentation of 

 the silky fowl. For example, the matings given by Bateson 

 for the case of pink eyes in cinnamon canaries would be 

 interpreted by me as follows. The allelomorphs are B, b, 

 presence and absence of the factor for black eye, b being 

 coupled with the female sex-character. Instead of using the 

 ordinary symbols for male and female, it is necessary on my 

 hypothesis to use M, m, for dominant and recessive sperms, 

 and F, f, for dominant and recessive ova. Then the matings 

 become — 



1. Cinnamon pink-eyed female with black-eyed male 



Composition bbFm BBMf 



gametes bF bf, BM, Bra 



result, black-eyed hens and black-eyed cocks 

 BbFm BbMf 



2. Black-eyed female with cinnamon pink-eyed male 



Composition BbFm bbMf 



gametes bF, Bf bM, bm 



result, pink-eyed hens, black-eyed cocks 

 bbFm BbMf 



3. Pink-eyed female with black-eyed male from I 



Composition bbFm BbMf 



gametes bF, bf BM, bM, Bm, bm 



result, black-eyed hens, black-eyed cocks 

 BbFm BbMf 



pink-eyed hens, pink-eyed cocks 

 bbFm bbMf 



4. Black-eyed female with black-eyed male from I 



Composition BbFm BbMf 



gametes bF, Bf BM, Bm bM, bm 



result, black-eyed hens, black-eyed cocks 

 BbFm BBMf 



pink-eyed hens, black-eyed cocks 

 bbFm BbMf 



In all these cases the facts ascertained can be explained by one 



