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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.
Because their effects add up to influence the phenotype. When genes interact additively, the phenotype usually reflects the contributions of every gene that is involved. Height, hair curliness, skin color, are usually the result of additive genes. Dominant-recessive genes are nonadditive, the dominant gene usually controls the characteristic even when a recessive gene is the other half of a pair.