ALLEN. — THE HEREDITY OF COAT COLOR IN MICE. 85 



TABLE G (ronimuccl). 



scribed no albino offspring result. The nature of the resulting offspring 

 is discussed under a separate heading. 



In these experiments two black-white males were bred to a number of 

 albino females, and all of the young (forty-three in number) were pig- 

 mented. A third black-white mouse, a half-brother to the two just 

 mentioned, was also bred to the same stock of females, and produced 

 pigmented as well as albino young. He, therefore, had the albino char- 

 acter recessive, and was what we have called a hybrid mosaic. All the 

 pigmented mice obtained from these three animals bred to albinos are, 

 by formulae (1) and (6), hybrid in respect to the mosaic and the albino 

 characters, and should form gametes one-half of which have the dominant 

 (mosaic) character only, and one-half the albino character only. "When 

 these pigmented hybrids are intercrossed, the Mendelian expectation 

 is (formula 2) that 25 per cent of the young will be albinos. The 



