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Sex-Linked Inheritance in Humans

A haemophilic...

Question

A haemophilic man marries a normal (non-carrier) woman. What is the possibility of them having a daughter suffering from haemophilia?

A

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B

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C

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D

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Solution

The correct option is A
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For the daughter to suffer from haemophilia, both the X chromosomes would need to have the gene for haemophilia. However, since the woman is a non-carrier, only one chromosome (from the father) will have the gene for haemophilia. Therefore, while none of the daughters will suffer from haemophilia, all of them will be carriers.

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