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Question

The gene of haemophilia is present on X chromosome. If a hemophilic male marries a normal female, the probability of their son being hemophilic is

A
Nil
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B
25%
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C
50%
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D
100%
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Solution

The correct option is A Nil
  • The mother is normal having the genotype XHXH. The father is affected having the genotype XhY.
  • The child receives one set of chromosomes from the mother and one set from the father.
  • The child for being a male should receive the XH chromosome from mother and Y chromosome from the father which will result the genotype of XHY.
  • So, there are no chances that the child will be hemophilic.
  • Thus, the correct answer is option A.

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