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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.
Some traits are nearly a â¦ ll due to expression of a  genetic factor, even a single gene, however most traits are a  combination of genetic elements and their combined expression. The  expression of many traits are determined from a combination of  genetic, age, and environmental factors.