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THE MENDEL JOURNAL 



what in past days we should have called the corre- 

 lation or coupling of the pink-eyed condition with 

 femaleness. Now we regard it not as a coupling of 

 femaleness and pink-eyedness, but as a gametic 

 repulsion existing between femaleness and black- 

 eyedness. It is important to bear in mind that this 

 repulsion exists in the gametes (germ-cells) only, 

 and that the female is a dominant and a hybrid 

 with regard to sex. That being so, hen birds may 

 be black-eyed ; but it must be remembered that 

 while the zygote (the individual) manifests femaleness 

 and black-eyedness, all its germ-cells which carry 

 femaleness will only carry pink-eyedness. Its visible 

 femaleness combined with black-eyedness is due 

 to the fact that both these qualities, as well as 

 maleness and pinkness, which are both recessive, 

 were brought in at the fertilisation of the egg- cell 

 from which it has developed. 



We may tabulate these facts and their associated 

 hypotheses as follows : — 



* See Second note, page 146, 



