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Analyses focus on a group of genetically homogeneous respondents identified as being of ancestral European origin (. In step 1, we test whether friends are more genetically similar to one another than to randomly selected peers.

Our second analysis tested whether friends were more similar to one another on specific phenotype-related genetic dimensions.

For these reasons, in the present study, we characterize genetic homophily within adolescent social networks in the United States.

Specifically, we analyze data from the National Longitudinal Study of Adolescent to Adult Health (Add Health) (23).

This subtle genetic similarity was observed across the entire genome and at sets of genomic locations linked with specific traits—educational attainment and body mass index—a phenomenon we term “social–genetic correlation.” We also find evidence of a “social–genetic effect” such that the genetics of a person’s friends and schoolmates influenced their own education, even after accounting for the person’s own genetics.

Humans tend to form social relationships with others who resemble them.

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