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A man whose father was colour blind mar-...

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

A

0.25

B

0

C

0.5

D

0.75

Text Solution

Verified by Experts

The correct Answer is:
A
As colour blindness is a sex-linked recessive genetic disorder, for it is present at X-chromosome. Thus, according the gene to the situation given in the question, a man whose father was colour blind (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)
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