If a colour blind female marries a man whose mother was also colour blind, what are the chances of her progeny having colour blindness ?

Question

If a colour blind female marries a man whose mother was also colour blind, what are the chances of her progeny having colour blindness ? (A) 100 % (B) 25 % (C) 50 % (D) 75 %

Tardigrade Admin · Accepted Answer

Mother - Colourblind (XC XC) Father - Colourblind (XC Y. ) (A male progeny receives X chromosome from the mother. Since mother is colourblind, son is also colourblind). XC XC-XC XC-XC Y-XC Y-F 1 Generation 100 % progeny will be colour blind.

Q. If a colour blind female marries a man whose mother was also colour blind, what are the chances of her progeny having colour blindness ?

$100%$

$25%$

$50%$

$75%$

Mother - Colourblind $(X^{C} X^{C})$ Father - Colourblind $(X^{C} Y$ ) (A male progeny receives $X$ chromosome from the mother. Since mother is colourblind, son is also colourblind). $X^{C} X^{C} - X^{C} X^{C} - X^{C} Y - X^{C} Y - F 1$ Generation $100%$ progeny will be colour blind.