Q:

What are some examples of polygenic inheritance?

A:

Examples of polygenic inheritance in humans include height, eye color and skin color. Physical traits that have polygenic inheritance are influenced by more than one gene and typically display a continuous distribution, such as a range of heights. Polygenic traits do not have the classic phenotypic ratios of Mendalian inheritance.

The following are also examples of polygenic traits in humans:

  • Weight
  • Lupus
  • Fingerprints
  • Heart health
  • Behavioral traits

These traits have the following genetic characteristics:

  • At least two genes contribute to the phenotypic expression
  • The traits are typically quantified using measurement, rather than counting as with Mendalian inheritance
  • The phenotypic expression of the trait can vary over a wide range
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