Principle of Inheritance and VariationHard

Question

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

Options

A.

0

B.

0.5

C.

0.75

D.

1

Solution

Colourblindness is X-linked recessive disease and shows criss-cross inheritance.
100% - carrier daughters (Phenotypically normal)
100% - Normal son

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