Question

what does it mean for a trait to be both polygenic and multifactorial?
○ two genes both influence a trait as long as a specific hormone is present in the correct quantity.
○ several alleles exist for a gene, and the expression of the trait is determined by how a single environmental factor interacts with the alleles.
○ multiple genes each produce aspects of a trait, and environmental factors influence the expression of those genes.
○ a single allele is responsible for a specific trait, but its expression can be altered by multiple environmental factors.
○ one gene determines a trait, but it can show a range of variation depending on which hormones are present.

Explanation:

A polygenic trait is controlled by multiple genes, each contributing to the trait. A multifactorial trait involves both genetic factors (like multiple genes) and environmental influences on their expression. This option combines both: multiple genes (polygenic) and environmental factors affecting gene expression (multifactorial). Other options are incorrect because they either involve single genes/alleles (not polygenic) or single environmental factors (not fully multifactorial).

Answer:

Multiple genes each produce aspects of a trait, and environmental factors influence the expression of those genes.