A colour blind man marries a woman with norma | vedclass

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Question

(b) : When a colour blind man $(X^cY)$ marries a normal woman $(XX)$, all of their daughters are carriers and all of their sons are normal, as shown i

Vedclass · Accepted Answer

$0.25$

Vedclass · Answer

(b) : When a colour blind man $(X^cY)$ marries a normal woman $(XX)$, all of their daughters are carriers and all of their sons are normal, as shown in following figure: When the carrier daughter $(XX^c)$ is married to a normal man, the probability of their son being colour blind is $0.25$, as shown in following figure:From above crosses, it is clear that the probability of occurrence of colour blindness in the grandson of a colour blind man and a normal woman is $0.25$.

A colour blind man marries a woman with normal sight who has no history of colour blindness in her family. What is the probability of their grandson being colour blind ?

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