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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.
Single Gene Traits in Humans. The following is a list of some autosomal human traits that have been attributed to a single gene. Although clearly other genes are involved, the inheritance of each of these phenotypic traits acts as if it were governed by a single gene. First, indicate your expression of the trait (i.e., circle the appropriate phenotype).