What do geneticists call alleles that are both expressed in the phenotype when they are together?
a. hybrids
b. codominance
c. heterozygous
d. incomplete dominance pick one you

The correct answer is:

b. codominance

Explanation:

Codominance is a kind of dominance wherein the alleles of a gene set in a heterozygote are fully represented. This results in offspring with a phenotype that is not dominant nor recessive. A typical example telling codominance is the ABO blood group system.

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