Principle of Inheritance and VariationMediumBloom L3

Question

A colour blind man marries a woman with normal sight who has no history of colour blindness in her family. What is the probability of their grandson being colour blind? [NEET 2015 RS]

Options

A.1
B.Nil
C.0.25
D.0.5

Solution

Sol.(c) [Key Concept: X-linked Colour Blindness — Grandson Probability]

XX × XcY

Normal women Colourblind man

The daughters of this couple will have normal eye sight and carrier if one of the carrier daughter marries with normal eyed man.

XXc × XY

Normal women Normal man

Only 25% grandson will show colour-blindness.

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