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Polygenic inheritance occurs when one characteristic is controlled by two or more genes. Often the genes are large in quantity but small in effect. Examples of human polygenic inheritance are height, skin color, eye color and weight. Polygenes exist in other organisms, as well.
The term âpolygenic inheritanceâ is used to refer to the inheritance of quantitative traits, traits which are influenced by multiple genes, not just one.In addition to involving multiple genes, polygenic inheritance also looks at the role of environment in someone's development.olygenic inheritance refers to any trait, such as human skin color, that can be expressed in varying gradients because it is influenced by multiple genes. Early Mendelian genetics focused on simple traits that could be explained by a single gene.