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The answer is polygenic traits. Polygenic traits are determined by an interaction of multiple genes. As the name suggests, poly (Greek) means many, thus, polygenic means many genes. Many genes interact and together influence some phenotypic trait. Quantitative phenotypes are usually attributed to the polygenic effects.
Running the Gamut. Multiple genes and, therefore, multiple alleles, affect continuous, or quantitative, traits. Because they are caused by more than one gene, they are also referred to as polygenic traits. Gene expression is complex, and continuous traits can also be influenced by environmental factors. Continuous traits are common in humans, who show a wide range of possibilities in characteristics such as height, skin color, learning ability and blood pressure.