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Genetic similarity among friendship networks is important for at least two reasons.First, social networks can influence mating markets, so genetic similarity among friends may be one source of genetic similarity among spouses.Moreover, it is also a time of heightened salience for peer networks and influence (19–22).For these reasons, in the present study, we characterize genetic homophily within adolescent social networks in the United States.Marriage is not the only social grouping to evidence genetic selection.Adult friends are, on average, more genetically similar than random pairs from the population (13).Although there is some evidence that friends have correlated genotypes, both at the whole-genome level as well as at trait-associated loci (via polygenic scores), further analysis suggests that meso-level forces, such as school assignment, are a principal source of genetic similarity between friends.

Of course, you may only want to click on that link if you not worried about a snooping partner or IT team wondering why you’re visiting a site affiliated with Adult Friend Finder.;) Read more: Millions of Adult Friend Finder members exposed after hack.Our study reported significant findings of a “social genome” that can be quantified and studied to understand human health and behavior.Second, there may exist social–genetic effects—the effects of alter’s genotype on ego’s phenotype (1, 14, 15)—which would further suggest that social sorting on genotype may have consequences for the distribution of phenotypes in a population beyond its effect on subsequent generations through assortative mating.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).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.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.As part of the survey, students were asked to list the names of their friends.Responses were collated within schools to identify social ties between individuals and their friends (24).Humans tend to form social relationships with others who resemble them.Whether this sorting of like with like arises from historical patterns of migration, meso-level social structures in modern society, or individual-level selection of similar peers remains unsettled.

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