178 



GENETICS 



Offspring of 1 and 7 



Offspring of 3 and 5 



$ 1 3 I 5 5 



FIG. 36. A case of three generations of ear-length in rabbits. 

 0-6, average ear-length of the first filial generation (FJ. 

 a'-b', average ear-length of the F 2 generation derived from 

 1 and 7. Data from Castle, in collaboration with Walter, 

 Mullenix and Cobb. 



ear-length of rabbits which included 70 different litters 

 of rabbits containing 341 individuals. In none of these 

 experiments could the blend in the second filial genera- 



