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Haemophilia is more common in males because it is a

1. Recessive character carried by Y chromosome
2. Dominant character carried by Y chromosome
3. Dominant trait carried by X chromosome
4. Recessive trait carried by X chromosome

Correct answer: Recessive trait carried by X chromosome

Solution

Haemophilia is X-linked recessive, so males (XY) express it if their only X carries the faulty allele. Females (XX) usually need two faulty copies, so the condition appears less often in them.

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