Question

Inheritance of blood group is a condition of: -

(A) Co-dominance

(B) Incomplete dominance

(C) Multiple allelism

(D) Multiple gene

• A. A, B
• B. B, D
• C. B, C
• D. A, D
• E. A, C

Answer 1

The correct option is E A, C

• When alleles show a co-dominant relationship, none of the alleles is dominant and both are expressed in the phenotype of the heterozygote. The human ABO blood groups provide a good example of codominance. The ABO system is due to a gene that codes for molecules on the surface of red blood cells.
• A number of human traits are the result of more than two types of alleles. Such traits are said to have multiple alleles for that trait. Blood type is an example of common multiple allele traits. There are three different alleles for blood type, (A, B, and O). A is dominant to O, B is also dominant to O, and allele A and B are both codominant.

Thus, the inheritance of the blood group shows both co-dominance and Multiple allelism.