HOMOZYGOUS BLACK "MM" 

 ( 



germ 

 cells 



M 



U 



.v2l 



^4 





KA.-^S^ A 



GRAY "mm" 



germ 

 cells 



-♦m 



F. 



germ 

 cells 



M 



m 



M 



V germ 

 ' cells 



HOMOZYGOUS 



BLACK "MM" 



(about 14) 



HETEROZYGOUS 



BLACK "Mm" 



(about 2/4) 



GRAY 



mm 



(about 'U) 



FIG. 17.1. Mendelian inheritance of melanism (black color) in the European 

 hamster. 



