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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?(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

Answer»

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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