Article
Friendship and natural selection.
Proceedings of the National Academy of Sciences of the United States of America - 22 Jul 2014
Christakis Nicholas A, Fowler James H
Abstract excerpt
More than any other species, humans form social ties to individuals who are neither kin nor mates, and these ties tend to be with similar people. Here, we show that this similarity extends to genotypes. Across the whole genome, friends' genotypes at the single nucleotide polymorphism level tend to be positively correlated (homophilic). In fact, the increase in similarity relative to strangers is at the level of...
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