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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.
The reason for. the variation we see is that organisms, like humans, have different forms of genes, which we term. alleles. These alleles code for different proteins, and therefore result in the expression of different. traits or phenotypes.