Question

complete the sentence using one of the following terms: codominance, incomplete dominance, or polygenic. occurs when the phenotype of a heterozygote offspring is blended, or somewhere in between the phenotypes of the two alleles inherited.

Explanation:

• Codominance: Both alleles are expressed simultaneously in the phenotype of the heterozygote (e.g., roan cattle with both red and white hair).
• Incomplete dominance: The phenotype of the heterozygote is a blend (intermediate) of the phenotypes of the two homozygotes. For example, in snapdragons, a red - flowered plant (\(RR\)) and a white - flowered plant (\(rr\)) produce pink - flowered (\(Rr\)) offspring.
• Polygenic: Traits are controlled by multiple genes (e.g., human height, which is influenced by many genes).

Since the description is about a blended phenotype in a heterozygote, we consider the definitions of the three terms.

Answer:

Incomplete dominance