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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.
Genes determine traits, or characteristics, such as eye, skin, or hair color, of all sexually-reproducing species. Each gene consists of two alleles: one comes from the mother and one from the father. Some alleles are dominant, meaning they ultimately determine the expression of a trait.Other alleles are recessive and are much less likely to be expressed.When a dominant allele is paired with a recessive allele, the dominant allele determines the characteristic. When these traits or characteristics are visibly expressed, they are known as phenotypes.The genetic code behind a trait is known as the genotype.hen a dominant allele is paired with a recessive allele, the dominant allele determines the characteristic. When these traits or characteristics are visibly expressed, they are known as phenotypes.