Question

Two AB blood group persons marry and have children A, AB and B blood groups in ratio of 1 : 2 : 1. Protein electrophoresis shows that in AB individuals both 'A' and 'B' proteins occur. This is an example of ____________.

• A. Complete dominance
• B. Codominance
• C. Incomplete dominance
• D. Partial dominance.

Answer 1

The correct option is B Codominance

The blood groups of parents is AB and their genotypes is I^AI^B. The blood groups and genotypes of the children are A(I^A I^A), B(I^B I^B), and AB (I^A I^B). It is called codominance. The phenotypic and genotypic ratio is 1:2:1.

So, the correct option is ‘Codominance’.