COAT CHARACTERS IN GUINEA-PIGS AND RABBITS. 



The matings which have been made between pure rough parents 

 and smooth ones may be summarized as follows : 



[Abbreviations : tf. - rough ; PR. = partial rough ; .S'wr. = smooth.] 



It will be observed that every one of the 186 young produced by this 

 experiment bears the rough character, all but 20 of them having it fully 

 developed (Condition A) ; the character of the exceptional 20 partial- 

 rough animals varies from Condition B to Condition D. 



PREPOTENCY AND DOMINANCE. 

 The matings which produced the 20 partial-rough young are of par- 

 ticular interest. In detail they are as follows : 



The partial rough young, it will be noticed, were all produced by 

 five (or possibly six) mothers. Unfortunately, there is some uncertainty 

 as to the mother of the first of the lots of young enumerated. The two 

 females (9 208 and 9 996) had 6 young together at the same time, and 

 so it was impossible to separate the young by litters, but from the color- 

 ation and size of the young I think it probable that 9 208 was the 

 mother of the 4 partial-rough young. But 9 996 was of the same 

 smooth stock as 9 208, and it would not be surprising if her gametes 

 had a similar potency. Unfortunately, no further tests with these 

 mothers could be made, for they both died soon after producing the 

 young enumerated. The two females, 9 2005 and 9 2056, were both 

 mated with the same rough males (d* 2002 and d 1 2059). The former 

 produced only partial-rough young by both males ; the latter produced 



