Dictionary of Human Evolution and Biology

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Coefficient Of Relatedness

Probability that alleles at any particular locus in two individuals are identical by descent. In closely related people r is predictably high, such as third-degree relatives (first cousins, r 1/8), second-degree (grandparents and grandchildren, r1/4), and first-degree relatives (parents and their offspring, or siblings, r 1/2). In identical twins, r

1. Aka Wright’s inbreeding coefficient, panmictic index, coefficient of relationship.

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