Question

Which of the following disorders is not caused by pleiotropic alleles _______________.

• A. Sickle cell anemia
• B. Cystic fibrosis
• C. Phenylketonuria
• D. Erythroblastosis foetalis.

Answer 1

The correct option is D Erythroblastosis foetalis.

A.Sickel cell anaemia – Pleiotropic alleles

B.Cystic fibrosis – Pleiotropic alleles

C.Phenylketonuria – it is autosomal recessive disorder.

D.Erythroblastosis foetalis – It is also called hemolytic disease of the newborn, type of anemia in which the red blood cells (erythrocytes) of a foetus are destroyed in a maternal immune reaction resulting from a blood group incompatibility between the foetus and its mother.

So, the correct option is ‘Erythroblastosis foetalis’.