Pick out the correct statements:
I: Haemophilia is a sex-linked recessive disease.
II: Down’s syndrome is due

Question

Pick out the correct statements:
I: Haemophilia is a sex-linked recessive disease.
II: Down’s syndrome is due to aneuploidy.
III: Phenylketonuria is an autosomal recessive gene disorder.
IV: Sickle cell anaemia is an X-linked recessive gene disorder

Accepted Answer

1. Haemophilia is a sex-linked recessive disease .
2. Down’s syndrome results from the gain of an extra copy of chromosome 21 (trisomy), which is a type of aneuploidy caused by failure of segregation of chromatids , .
3. Phenylketonuria is an inborn error of metabolism inherited as an autosomal recessive trait .
4. Sickle-cell anaemia is an autosome linked recessive trait, not an X-linked disorder . 
Therefore, statements I, II, and III are correct.

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