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If half of the male offspring exhibit haemophilia, does this indicate that the gene responsible for haemophilia is carried on the mother's X chromosome?

1. Yes, this is correct.
2. No, this is not correct.
3. It cannot be concluded from the given information.
4. None of these options are applicable.

Correct answer: Yes, this is correct.

Solution

Haemophilia is an X-linked recessive disorder. If half the sons are haemophilic, it indicates that the mother is a carrier of the defective gene on one of her X chromosomes.

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