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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.

In step 3, we evaluate a potential implication of genetic similarity among friends: social–genetic effects, or the association between the genotypes of one’s social peers and one’s own phenotype (net of own genotype).

We tested whether friends were more genetically similar to one another compared with random pairs of individuals.

Adolescence is a critical developmental period in which patterns of health behaviors and overall mental health established during this phase continue through the life course (16) and may affect socioeconomic attainment (17, 18).

Moreover, it is also a time of heightened salience for peer networks and influence (19–22).

To address potential confounding of analysis by ancestry, we focused on unrelated respondents of European ancestry.

We also conducted analysis of genetic relatedness of the full Add Health sample using the REAP algorithm (26), which is designed to estimate genetic similarity in the presence of population stratification. Estimates of genetic similarity among friends were positive (Table 1).

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In a national sample of more than 5,000 American adolescents, we found evidence of social forces that act to make friends and schoolmates more genetically similar to one another compared with random pairs of unrelated individuals.We considered the genetics of three phenotypes: height, body mass index (BMI) (a measure of adiposity), and educational attainment.We used polygenic scores to summarize phenotype-related genetics.Add Health surveyed 90,118 US adolescents aged 12–18 in 1994–1995 using a school-based sampling frame.As part of the survey, students were asked to list the names of their friends.

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