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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.
Definition. It describes the phenomenon of differing clinical features or phenotype among individuals carrying the same gene allele or genotype. Expressivity differs from penetrance, which describes the probability that a genetic variation (or allele) will yield the phenotype at all.Variable expression of a phenotype may be influenced by other genetic variations, epigenetic factors, or environment.This term is often used in conjunction with explanations of variable severity of autism-related traits within families.efinition. It describes the phenomenon of differing clinical features or phenotype among individuals carrying the same gene allele or genotype. Expressivity differs from penetrance, which describes the probability that a genetic variation (or allele) will yield the phenotype at all.