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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.
1. Genes are the sole determinants of traits. Genes are typically not the only determinants of traits. Although a few traits, such as blood type, are determined strictly by genetics, most traits are influenced both by genes and the environment in which we live. We do not inherit a disease, instead we inherit susceptibility factors that increase risk for a disease.