SPECIAL CASES 



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 



50CX 



9 



cr cr 



xx 



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. 



