SPECIAL CASES OF SEX-INHERITANCE 241 



<n> <o> 



9 a 



X 



XX 



<o> <o> 



9 



icr 



iCT 



X( 



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 



)CXX 



&m><>mm XX X© X 



9 9 cr cr 



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. 



