160 



MULTIPLE ALLELOMORPHS 



(second wild type) are allelomorphs. It will be ob- 

 served here that the factor in the wild type gray 

 mouse is responsible for the appearance in each 

 hair of the three pigments, chocolate, yellow and 



d 



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a 



Fig. 51. — Four allelomorphic characters in the silkworm: a, Chinese 

 striped yellow; 6, Chinese moricaud yellow; c, Japanese normal yellow; 

 d, Chinese plain white. 



black. Gray is therefore a mosaic effect, for these 

 colors are stratified in each hair from the base out- 

 ward in the order above named. The allelomorphic 

 factor for yellow gives rise to only one of these 



