SEGREGATION OF COLORS IN THE SECOND GENERATION 



A white male (mutant g), apparently a true albino, was mated with a normal wild black female 

 possessing the usual stripes, and produced six normal wild striped black young. This type of 

 mutation therefore was shown to be recessive to the wild character. The following year two of 

 these young were mated and produced a litter of five young, four black and one white. This white 

 with one of the black ones is shown above. They present a case of simple Mendelism. (Fig. 8.) 



extreme precautions had to be used, 

 since the mother was likely to kill her 

 young litter, if prematurely disturbed. 

 The Fi young were as follows : 



93 ] 



9 3a 



9 3b 



9 3c 



9 3d 



d^3f . 



Mutant 9 c gave no young in 1916; 

 she may have aborted or eaten the 

 young. Mated to a medium grade male 

 in 1917 she gave a litter of four young 

 of medium grade in the spring as 

 follows: 



All these Fi young were black of^a 

 > medium grade — i.e., with white 

 cap and short stripes. 



All these Fi young were black 

 with split star, and white tip on 

 tail. Two of them had a small 

 narrow nose spot. 



94 

 95 

 96 



c?7 



The total eleven normal wild Fi off- 

 spring demonstrated quite conclusively 

 that this mutation is recessive to the 

 wild from which it arose. 



Of these Fi offspring, cf 7 was success- 

 fully mated three times giving two 

 Utters by 9 6 in the spring of 1918 and 

 1919 and one by 9 5 in the spring of 

 1919 as follows: 



c^7 X 96 



c?8 1 



cf9 : 



9 101 



normal wild black with 

 variable striping. 



