NEET 2014 Biology question

Biology Principles of Inheritance and Variation NEET 2014

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?

(1)25%
(2)0%
(3)50%Correct
(4)75%

Answer: (3)

Solution

Colour blindness is X-linked recessive. The man is normal (XY); the colour-blind father passes only his Y chromosome to him, so the father's genotype is irrelevant. The woman received X from her colour-blind mother and X

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Question ID VK-091639