What are the chances of colour-blind daughter | vedclass

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Question

(D) Colour-blindness is an $X$-linked recessive trait. $A$ woman whose father was colour-blind must be a carrier $(X^cX)$ because she inherits one $X$

Vedclass · Accepted Answer

$50\%$ of sons are colour-blind and all daughters are phenotypically normal.

Vedclass · Answer

(D) Colour-blindness is an $X$-linked recessive trait. $A$ woman whose father was colour-blind must be a carrier $(X^cX)$ because she inherits one $X$ chromosome from her father (who must have been $X^cY$) and one from her mother. When this carrier woman $(X^cX)$ marries a normal man $(XY)$,the cross is as follows: Parents: $X^cX 	imes XY$ Gametes: $X^c, X$ and $X, Y$ Offspring: $X^cX$ (Carrier daughter),$XX$ (Normal daughter),$X^cY$ (Colour-blind son),$XY$ (Normal son). Thus,$50\%$ of the sons will be colour-blind,and all the daughters will be phenotypically normal (though $50\%$ of them will be carriers).

What are the chances of colour-blind daughters and sons being born in a marriage between a normal man and a normal woman whose father was colour-blind?

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