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Home » 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? (1) 0.25 (2) 0.5 (3) 1 (4) Nil
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? (1) 0.25 (2) 0.5 (3) 1 (4) Nil
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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? (1) 0.25 (2) 0.5 (3) 1 (4) Nil

Correct option: A colour blind man marries a woman with normal sight who has no history of colour blindness in her family. the probability of their grandson being colour blind  50%(.5).

Explanation for the correct option:

  • Colour-blindness is a homozygous recessive trait associated with the X chromosome.
  • The genotype of the father would have one colour blindness defect causing chromosome.
  • The daughters are definite to be a carrier in every case when crossed with a normal women.
  • The grandson obtained would have the 50% chance of coming up with the same disease
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