Question

Inheritance of 'ABO' blood group' shows:

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

Answer 1

The correct option is B

Multiple allelism

The correct option is B:

Explanation of the correct option:

1. Multiple allelism is a non-Mendelian inheritance pattern.
2. The inheritance of ABO blood groups illustrates multiple allelism.
3. Here, a single gene encodes an enzyme responsible for attaching sugar residues to a specific glycoprotein on the red blood cell membrane.
4. Three different alleles of this gene are known.
5. The multiple alleles which produce the phenotype of type A, type B, type AB, or type O blood are type A (IA), type B (IB), and type O.

Explanation of the incorrect options:

Option A:

The heritable condition of possessing more than two complete sets of chromosomes which are common among plants is called polyploidy.

Option C:

A cross in which each parental contribution is genetically unique and gives rise to progeny whose phenotype is intermediate, which is known as incomplete dominance.

Option D:

Characteristics such as height or skin color that are influenced by two or more genes are called polygeny.

Final answer: Inheritance of 'ABO' blood group' shows multiple allelism.