A man whose father was colour blind marries a woman who had a colour blind mother and normal father. What percentage of male children of this couple will be colour blind?

Question

Accepted Answer

50%. Colour blindness is X-linked recessive. The man must be X^cY, and the woman, having a colour-blind mother and normal father, is X^CX^c; half of their sons receive X^c from her and will be colour blind.

A man whose father was colour blind marries a woman who had a colour blind mother and normal father. What percentage of male children of this couple will be colour blind?

Solution

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