VARIATION AND HEREDITY 



231 



the same thing would be alternative to one another - 

 that either rose or pea would dominate in the hybrids, 

 and that the F 2 generation would consist of domi- 

 nants and recessives in the ratio 3:1. The result 

 of the experiment was, however, very different. The 



B 



C ' ' ' \}\^-^ Q 



FIG. 84. Fowl's combs: A, pea; B, rose; C, single; D, walnut. 



cross rose x pea led to the production of a comb 

 quite unlike either of them. This, the so-called 

 walnut comb (fig. 84, Z>), from the resemblance to 

 the half of a walnut, is a type of comb which is 

 normally characteristic of the Malay fowl. More- 

 over, when these FI birds were bred together, a 



