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This condition arises from a recessive mutation on the X chromosome. Males are affected because they possess only one X chromosome, making them express traits linked to it.
- Cretinism
- Cystic fibrosis
- Haemophilia
- Thalassemia
Correct answer: Haemophilia
Solution
Haemophilia is classically inherited as an X-linked recessive trait, so males with one mutated X chromosome express the disorder. The other options are not X-linked recessive conditions.
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