coefficient of relatedness

the mean number of genes shared between two related individuals. Identical twins share 100% of their genes and have a coefficient of relatedness of 1. Between siblings and between parents and offspring, the coefficient of relatedness is .5; between uncles or aunts and nieces or nephews and between grandparents and grand-offspring, it is .25; and between first cousins, it is .125. Most studies of kin recognition and kin-directed behavior show effects only with coefficients of relatedness of 0.25 and greater. See also inclusive fitness.

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Psychology term of the day

February 23rd 2025

electrotonus

n. the change in the excitability, conductivity, or electrical status of a nerve or muscle following application of an electric current.