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Heritability refers to the proportion of variation among individuals in a population that can be attributed to genetic differences. It is a statistical concept that helps quantify the extent to which genetics influences a particular trait, such as personality.

Heritability of Personality Traits

The genetic basis of personality is complex and not determined by single genes. Instead, personality traits are polygenic, arising from the combined effects of many genes. Additionally, epigenetic factors are critical, as they regulate gene expression, influencing whether and how these genes affect an individual's personality.

Polygenic and Epigenetic Influence on Personality

A large-scale study of twins finds that the heritability of the personality trait 'agreeableness' is approximately 0.40. What is the most accurate interpretation of this finding?

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