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Question
Which of the following is sex-linked?
Options
Phenylketonuria
Haemophilia
Diabetes malletus
Thalassaemia
MCQ
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Solution
Haemophilia
Explanation:
Haemophilia is a sex-linked recessive disorder caused by a gene mutation on the X-chromosome. It predominantly affects males because males have only one X-chromosome, so a single defective gene causes the disease. In contrast, Phenylketonuria, Diabetes mellitus, and Thalassaemia are autosomal disorders and are not linked to sex chromosomes.
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