Question

if two alleles are codominant,
a both will express themselves in a blended phenotype
b only one of the two will express themselves by random selection
c only one of the two will express themselves based on chromosome placement
d both will express themselves equally in the phenotype

Explanation:

Codominance is a genetic phenomenon where both alleles in a heterozygote are fully expressed. This means that neither allele is dominant or recessive, and both contribute to the phenotype of the organism. For example, in the ABO blood group system, if an individual has the \(I^A\) and \(I^B\) alleles, they have type AB blood, where both \(A\) and \(B\) antigens are expressed on the red blood cells. Option a refers to incomplete dominance (where there is a blended phenotype), options b and c are incorrect as they do not describe codominance.

Answer:

D. both will express themselves equally in the phenotype