184 



GENETICS 



;t 



....b' 



/ 2 34 56 



Offspring ofZsnd 5 



<S 99666 9 



e e e e E c 



e e e e 6 6 



o o o o to «> 



•»- r- t- c~- (B lo 



CM ' — '- 



e 



e 



oo 



6669 dd 



E E E- e E e 

 e e s e E E 

 o «X) to «o p w 



(S) ^Q iO iO t*» r* 



Offsprin^of land? 



Fig. 52. — A case of three generations of ear-length in rabbits, a-b, 

 average ear-length of the first filial generation (Fi). a'-b', average 

 ear-length of the F2 generation derived from 1 and 7. Data from 

 Castle, in collaboration with Walter, Mullenix and Cobb. 



upon the ear-length of rabbits which included 70 

 different litters of rabbits containing 341 individuals. 

 In none of these experiments could the blend in the 



