Adult sex friend sex addict dating site
We also observe apparent social–genetic effects in which polygenic scores of an individual’s friends and schoolmates predict the individual’s own educational attainment.
In contrast, an individual’s height is unassociated with the height genetics of peers.
Using the KING algorithm (25), we computed genetic kinships between all pairs of Add Health participants.
We then compared kinships among friends to kinships among random pairs of individuals to estimate the degree of genetic similarity among friends (3).
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.
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).
First, social networks can influence mating markets, so genetic similarity among friends may be one source of genetic similarity among spouses.
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.
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.