How can a female be haemophilic?(a) Mother is haemophilic and father is normal(b) Mother is a carrier and father is haemophilic(c) Both mother and father are carriers(d) Both mother and father are haemophilicI have been asked this question in a national level competition.My question is from Inheritance and Variation Principles topic in section Principles of Inheritance and Variation of Biology – Class 12

How can a female be haemophilic?(a) Mother is haemophilic and father i

1.	How can a female be haemophilic?(a) Mother is haemophilic and father is normal(b) Mother is a carrier and father is haemophilic(c) Both mother and father are carriers(d) Both mother and father are haemophilicI have been asked this question in a national level competition.My question is from Inheritance and Variation Principles topic in section Principles of Inheritance and Variation of Biology – Class 12
Answer» Correct choice is (B) Mother is a CARRIER and FATHER is haemophilic The best EXPLANATION: A female can only be haemophilic if her mother is at least a carrier of this disease and her father is haemophilic. But the possibility of a female becoming haemophilic is extremely rare because being haemophilic for the parents at the later STAGE of life is unviable.

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