A) 25%
B) 0%
C) 50%
D) 75%
Correct Answer: A
Solution :
As colourblindness is a autosomal recessive genetic disorder, for it is present at X-chromosome. Thus, according to the situation given in the question, a man whose father was colourblind (will be, i.e., XY normal) marries a woman whose mother was colourblind and father was normal (i.e., this woman will be a carrier) according to the cross given below Thus, when marriage will happen between a normal man and a carrier woman, in that case percentage of a male child to be colourblind is 25% (this can be easily observed from the cross given below)You need to login to perform this action.
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