38 



INHERITANCE IN GUINEA-PIGS. 



himself from parents known to transmit pink-eye. This indicates that 

 the character pink-eye in guinea-pigs (as in mice) may be transmitted 

 by albinos. The fact should be emphasized that the pink-eyed young 



TABLE 25. Young produced by red-eyed descendants of c?1002 mated with 

 albinos. (See also table 27.) 



produced in this mating were also red-eyed, i. e., were non-yellow, for 

 red-eyed animals may carry pink-eye as a recessive character, and con- 

 versely pink-eyed may carry red-eye as a recessive character. How- 

 ever, if these recessive characters crop out as recessive individuals 

 from a mating of two like parents with each other, it can in either case 

 occur only in the form of the double recessive, both pink- and red-eyed. 



TABLE 26. Young produced by pink-eyed descendants of tfl002, mated inter se. 



Pink-eyed animals (with yellow in their fur) have made their appear- 

 ance as recessives produced by mating dark-eyed animals inter se. 

 (See tables 20, 22, and 27.) In some cases red-eyed young have been 

 produced by the same matings, or pink-and-red-eyed or albinos, for 

 pink-eye seems to be quite independent of the color factor in its inherit- 

 ance. Pink-eyed animals mated inter se have produced only pink-eyed, 

 pink-and-red-eyed, and albino young. (See table 26.) Any of these 

 three forms so derived will doubtless be found to transmit pink-eye in 

 every gamete. 



Pink-and-red-eyed animals of whatever origin have been found to 

 produce (when mated with each other) only pink-and-red-eyed young 

 or albinos. But the record as regards albinos is doubtful. Two 



