SPECIAL CASES OF SEX-INHERITANCE 241 



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9 



9 ^ 



XX 



o o 



29 iC 



iCf 



«xx 



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 



MXX 



^«><0>-5i>]CX XX 



X( 



9 9 



cr 



a 



Fig. 115. — Diagram to indicate heredity of color bUndness 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. 



