"Relatedness" redirects here. For relatedness in semantics, see Semantic relatedness. For relatedness in psychology, see Self-determination theory.
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The coefficient of relationship is a measure of the degree of consanguinity (or biological relationship) between two individuals. The term coefficient of relationship was defined by Sewall Wright in 1922, and was derived from his definition of the coefficient of inbreeding of 1921. The measure is most commonly used in genetics and genealogy. A coefficient of inbreeding can be calculated for an individual, and is typically one-half the coefficient of relationship between the parents.
In general, the higher the level of inbreeding the closer the coefficient of relationship between the parents approaches a value of 1, expressed as a percentage,[a] and approaches a value of 0 for individuals with arbitrarily remote common ancestors.
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