40 



INHERITANCE IN GUINEA-PIGS. 



male (d"140) produced 2 pink-and-red-eyed young. A pink-and-red- 

 eyed male mated with 2 dark-eyed females of race B, which were hetero- 

 zygous in albinism, produced 4 dark-eyed and 4 red-eyed young. 

 Another pink-and-red-eyed male (140) mated with a dark-eyed female 

 descended from cf 1002 produced 1 pink-eyed young, in which red-eye 

 was undoubtedly recessive. Most of the foregoing matings are tabu- 

 lated in table 28. 



TABLE 28. Character of young produced in matings of pink-and-red-eyed descendants of <? 1002. 



Pink-and-red-eyed males mated with albinos of races free from pink- 

 eye produce red-eyed or albino young, but not pink-eyed young, since 

 pink-eye also is a recessive character and becomes visible only when 

 doubly represented in the zygote. 



It is clear, accordingly, that when pink-and-red-eyed animals are 

 mated with red-eyed animals (or albinos), young are produced which 

 are red-eyed, but in which pink-eye is recessive; and when the same 

 pink-and-red-eyed animals are mated with pink-eyed animals, young 

 are produced which are pink-eyed, but in which red-ey^ is recessive. 

 Hence the two characters, pink-eye and red-eye, are independent of each 

 other, though red-eye is the dominant allelomorph of albinism, with 

 which pink-eye is wholly unrelated. 



