Question

_____ is when a heterozygote expresses both homozygous phenotypes simultaneously, rather than expressing an intermediate phenotype

Answer 1

Complete dominance
Incomplete dominance
Codominance
none of the above

Answer 2

Codominance. When they're expressing traits from both parents, no single gene from either parent prevailed which means that they are going to both be seen in the phenotype instead of only the genotype. This means that they are both (co) dominant because they are seen in the phenotype.