30 



MENDELISM 



CHAP. 



result of the experiment was, however, very different. 

 The cross rose x pea led to the production of a comb 

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

 walnut comb (Fig. 4, D), from its resemblance to 



Fig. 4. 

 Fowls' combs. A, pea ; B, rose ; C, single ; D, walnut. 



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

 normally characteristic of the Malay fowl. Moreover, 

 when these F^ birds were bred together, a further 

 unlooked-for result was obtained. As was expected, 

 there appeared in the F2 generation the three forms 

 walnut, rose, and pea. But there also appeared 



