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Which of the following statements correctly describes genetic disorders: Sickle cell anaemia results from a faulty gene on chromosome 11, hemophilia is a recessive disorder linked to sex chromosomes, and Down’s syndrome arises due to trisomy of chromosome 21?

1. Sickle cell anaemia
2. Hemophilia
3. Down’s syndrome
4. All of the above

Correct answer: All of the above

Solution

All three conditions mentioned in the question are correctly described: sickle cell anaemia is due to a defective allele on chromosome 11, hemophilia is a sex-linked recessive disorder, and Down's syndrome results from trisomy of chromosome 21.

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