SEX-LIMITED INHERITANCE IN POULTRY 



TABLE 2 



Unions of sex-limited determiners for black iris pigmentation in pink-eyed X 

 black-eyed canary matings. 



Gametes 



Offspring 



Fi black-eyed 



B 



b 



'Bb 

 bb 



X 



pink-eyed 

 b 



B 

 b 



Half of the cf cf and 

 half of the 9 9 

 b 1 a k-e y e d ; the 

 others pink-eyed 



3. The case of the melanogenesis in the skin of the Silky fowl 

 was worked out by Punnett in connection with Bateson ('09) in 

 a series of experiments. The interpretation that they gave to 

 their results is comphcated; that afforded by the new theory 

 affords a simpler explanation. The unpigmented skin appears 

 to have an inhibitor (I) which the black skin of the Silky lacks (i). 



