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If a colour-blind man marries a woman wh...

If a colour-blind man marries a woman who is homozygous for normal colour vesion, the probability of their son being colour blind is

A

0

B

0.5

C

0.75

D

1

Text Solution

Verified by Experts

The correct Answer is:
A
If a colourblind man marries a woman who is homozygous for normal colour vision, the probaility of their son being colourblind is zero. Colour blindness is a recessive sex-linked trait in which the eye fails to distinguish between appears only when both sex chromosomes carry recessive gene `(X^(c) X^(c))`. However, in human males, the defect appears due to single recessive gene `(X^(c) Y)` because Y chromosome does not carry gene for colour vision. This disease shows criss-cross inheritance.

Thus, there is zero probability of son being colourblind. Hence, option (a) is correct.
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