Biology for IGCSE & O level - Inheritance (Section 5 - No. 9)
Codominance is best illustrated by which of the following examples?
Flower color in snapdragons (incomplete dominance).
ABO blood groups.
Seed shape in peas (complete dominance).
Height in pea plants (multiple alleles).
Explanation
In ABO blood groups, both the A and B alleles are expressed equally in the heterozygote (AB blood type).