THEORY OF EVOLUTION 77 



\ / X 6 



^^ XXX' 

 I ©■■ 



P"n-.. ;?H, A. Diaf^raiii ilhistrating inheritance of color blind- 

 ness in man ■ tlie iris of the color-blind eye is here black. 



^ ^ X© XX 



^^ XXX 



^ma XX M 



Flo. 38, B. Reciprocal of I'ross in Fig-. 3S 



barred. If these are inbred half of the daugli- 

 ters are black and half are barred all of the 

 sons are barred. The grandmother has trans- 

 mitted her color to half of her granddaughters 

 but to none of her grandsons. 



