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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.
Continuos Population Variation, controlled by multiple Loci, Phenotypes are measured in population, Phenotypic Traits are distributed over a range in the population. Simple Polygenic Inheritance. Two or more Loci lead to phenotype, no environmental influence on the phenotype, strictly genetic.