Dictionary of Human Evolution and Biology

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Twin Method

Strategy for estimating complex trait heritability in humans by comparing total phenotypic variances of monozygotic twins (MZT) against dizygotic twins (DZT), under the expectation that the variances will be equal in those traits that have no genetic contribution. The estimated heritability increases in proportion to the relative decrease in MZT twin variance as compared to DZT twin variance for the trait.

See F. Galton and Holzinger’s H.

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