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What is the percentage of children being a carrier of haemophilia if their mother is a carrier and their father is a normal man?

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in Biology – Class 12 by (271k points)
What is the percentage of children being a carrier of haemophilia if their mother is a carrier and their father is a normal man?

(a) 25%

(b) 50%

(c) 75%

(d) 100%

I have been asked this question in exam.

Enquiry is from Inheritance and Variation Principles in chapter Principles of Inheritance and Variation of Biology – Class 12

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The correct option is (a) 25%

Easiest explanation: The percentage of children being a carrier of haemophilia if their mother is a carrier and their father is a normal man is 25% because the gametes formed by mother are X and X^h while the gametes formed by father are X and Y. The genotype of the offspring obtained would be XY, XX, XX^h and X^hY. Thus 50% of children are normal, 25% are carriers of haemophilia and 25% are haemophilic (only son).

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