What kind of trait is controlled by two or more genes located at different loci?

A trait controlled by two or more genes located at different loci is identified as a polygenic trait. This means that multiple genes contribute to the phenotype of the trait, often resulting in a continuous range of variations. For instance, traits such as height, skin color, and weight are polygenic, as they are influenced by several genes, each having a small additive effect.

In contrast, a monogenic trait is determined by a single gene, which results in a distinct phenotype, such as the ability to roll one's tongue. Epistatic traits involve interactions between different genes where the effect of one gene can mask or modify the expression of another, while linked traits refer to genes that are located close together on the same chromosome and tend to be inherited together. Therefore, polygenic traits characterize the complexity of trait expression that results from the collective action of multiple genes.