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Pick out the correct statements : (1) Haemophilia is a sex-linked recessive disease (2) Down’s syndrome is due to aneuploidy (3) Phenylketonuria is an autosomal recessive gene disorder (4) Sickle cell anaemia is a X-linked recessive gene disorder

1. (1) and (4) are correct
2. (2) and (4) are correct
3. (1), (3) and (4) are correct
4. (1), (2) and (3) are correct

Correct answer: (1), (2) and (3) are correct

Solution

Haemophilia is classically X-linked recessive, Down’s syndrome results from aneuploidy (trisomy 21), and phenylketonuria is an autosomal recessive disorder. Sickle cell anaemia is not X-linked; it is an autosomal recessive gene disorder, so statement (4) is false.

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