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Question

A normal woman, whose father was colour blind is married to a normal man. The sons would be :


A

50% colour blind

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B

All normal

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C

All colour blind

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D

75% colour blind

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Solution

The correct option is A

50% colour blind


Colour blindness is an X-linked disorder.
All daughter of a colour blind man will be carrier.

If the carrier marries a normal man, then 50% of the sons will be colour blind.


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