Pick out the correct statements : (a) Haemophilia is a sex-linked recessive disease (b) Down's syndrome is due to aneuploidy (c) Phenylketonuria is an autosomal recessive gene disorder. (d) Sickle cell anaemia is a X-linked recessive gene disorder

1. A. (a) and (d) are correct
2. B. (b) and (d) are correct
3. C. (a), (c) and (d) are correct
4. D. (a), (b) and (c) are correct

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