Question

Inheritance of ABO blood groups illustrates

• A. Euploidy
• B. Polyploidy
• C. Incomplete dominance
• D. Multiple allelism

Answer 1

The correct option is D Multiple allelism

Multiple allelism is a non- Mendelian inheritance pattern. Inheritance of ABO blood groups illustrates multiple allelism. Here, a single gene code for an enzyme that is responsible for the addition of sugar residues to a specific glycoprotein on the membrane of red blood cells. Three different alleles of this gene are known. All three alleles have arisen by mutation from a single ancestor. Type A (I${}^A$), type B (I${}^B$), or type O are the multiple alleles which produce phenotype of type A, type B, type AB, or type O blood.

So, the correct answer is option D.