Question

Which of the following is an example of incomplete dominance?

Select one:

a. minor thalassemia

b. major thalassemia

c. beta thalassemia

d. polymorphism

e. ABO blood groups

Answer 1

e. ABO blood group

ABO blood group is an example of both Incomplete dominance and Codominance.

Incomplete dominance , also called semi-dominance or partial dominance is when  is a dominant allele, or form of a gene, does not completely mask the effects of a recessive allele, and the organism’s resulting physical appearance shows a blending of both alleles. In incomplete dominance neither allele is dominant but combine and display a new trait that is a mixing of the two allele, while in case of codominance, both alleles are dominant.