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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.
Many genes influence one phenotypic trait. One gene influences many phenotypic traits. Some genes mask the effects of other genes. Two alleles for a trait are equally dominant.