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NEETZoologyPrinciples of Inheritance and Variation

A man with blood group AB and normal colour vision marries a woman with blood group O who is a carrier for colour blindness. What is the probability that their first child will be a son who has blood group A and is colour-blind?

Options

  1. A1 4
  2. B1 16
  3. C1 8
  4. D1 2

Correct answer

C. 1 8

Step-by-step solution

The inheritance of ABO blood groups and colour blindness (a sex-linked recessive trait) assort independently. For blood groups: The father has blood group AB (genotype I^A I^B ) and the mother has blood group O (genotype ii ). A cross between them ( I^A I^B ii ) yields progeny with either blood group A ( I^A i ) or blood group B ( I^B i ) in equal proportions. Probability of the child having blood group A = 1 2 . For colour blindness and sex: The father has normal vision (genotype X^C Y ) and the mother is a carrie

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