SPECIAL CASES OF SEX-INHERITANCE 241 



<o 



<a> o 



9 cr 



Xi 



xx 



9 



lO^ 



Fig. 114. — Diagram to indicate heredity of color blindness through 

 male. A color-blind male (here black) transmits his defect to his grandsons 

 only. ; 



XX 



X 



^•*>-o>-3i>XX XX 



o o cr cf 



X 



9 9 



Fig. 115. — Diagram to indicate heredity of color blindness through 

 female. A color-blind female transmits color blindness to all of her sons, 

 to half of her granddaughters and to half of her grandsons. 



