DOMINANCE 



69 



and coloured birds in the expected ratio. There seems, 

 therefore, little reason to doubt that the dominant 

 white is a coloured bird in which the absence of 

 colour is due to the action of a colour-inhibitin£{ 



Fig. 14. 



Ears of beardless and bearded wheat. The beardless conditiun is dominant 

 to the Ijeartled. 



factor, though as to the nature of that factor we can 

 at present make no surmise. 



Experiments with plants may often, as we have 

 already seen, throw light upon the heredity of animals, 

 and the converse is equally true. The inhibitor in 

 poultry has its counterpart in wheat. Some early 



