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In this video we take a basic look at how to understand the role of genes on personality and how evolution may shape traits and select for a range of variance in a trait rather than extremes.

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Bouchard & Loehlin, 2001 - (I should have said "paper" not "study" as it is a review summarizing many studies): https://www.researchgate.net/publication/11654162_Genes_Evolution_and_Personality

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