A colour blind man marries a woman with normal sight who has no history of colour

A colour blind man marries a woman with normal sight who has no history of colour blindness inher family. What is the probability of their grandson being colour blind ?

Options

(a) 1
(b) Nil
(c) 0.25
(d) 0.5

Correct Answer:

0.25

Explanation:

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  • If the carrier daughter mary a normal man 50% of their grand sons will become colour blind
    If carrier daughter marries a colour blind man 50% of their grand daughter will be carriers
    So in both the above cases, the result shows 50% of grand sons will be colour blind which in terms of over all progress (son+daughter) come as 25% thus confirming the probability as 0.25

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