polygenic traits is not in our dictionary (yet). Here's what it could mean:

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noun

A characteristic or phenotype, such as height, skin color, or susceptibility to a disease, that is influenced by the combined effects of multiple genes rather than a single one.

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Examples of polygenic traits in humans include hair, eye, or skin color.

From Textbooks • Jan. 1, 2018

The influence of the environment is often important in polygenic traits.

From Textbooks • Jan. 1, 2018