GUINEA-PIGS FROM AREQUIPA. 



39 



albino young have been recorded as produced by c?88 mated with his 

 daughters, 9 204 and 9 205; but this same male mated with albino 

 females of race B produced 11 red-eyed young but no albinos, for which 

 reason it seems very doubtful whether he transmits albinism. More 

 probably the two young by pink-and-red-eyed mothers were not 

 albinos, but very pale-colored non-yellow young, possibly lacking the 

 extension factor, in which case their fur would be pure white, their eyes 

 being uncolored because of the pink-eye factor. If so, they would be 

 in appearance indistinguishable from albinos, though behaving very 

 differently in crosses. 



Table 27. — Matings of descendants of &1002 which have produced pink-eyed young. 



Nevertheless, it is to be expected that pink-and-red-eyed animals 

 can be produced which are heterozygous for albinism. Such animals 

 necessarily would be heterozygous for red-eye also, which is an allelo- 

 morph of albinism, and so would be of the formula C r C a pp, for it is 

 known (1) that pink-eyed animals may transmit albinism; (2) that red- 

 eyed animals may transmit albinism ; and (3) that pink-eye and red-eye 

 are independent of each other in transmission. Consequently, there is 

 every reason to suppose that albinism may exist as a recessive allelo- 

 morph of red-eye in animals which are both pink-eyed and red-eyed. 



A pink-eyed animal mated with a dark-eyed one produced 3 dark- 

 eyed young and 1 albino, which adds to the evidence that pink-eye is 

 recessive to dark-eye and may be present in the same zygote as albin- 

 ism. A pink-eyed animal (9 307) mated with a pink-and-red-eyed 



