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Which of the following most appropriately describes haemophilia?

1. Recessive gene disorder
2. X-linked recessive gene disorder
3. Chromosomal disorder
4. Dominant gene disorder

Correct answer: X-linked recessive gene disorder

Solution

Haemophilia is caused by a mutation on the X chromosome, so it follows an X-linked recessive pattern. Males are more commonly affected because they have only one X chromosome, while females are often carriers.

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