Abstract
Abstract Human beings often grow up with siblings and the behavior of one sibling may influence the behavior of the other sibling. In such cases, part of the ‘environment’ of individuals is predictable from the genotypes of their siblings. To detect sibling interactions, which are based on genotype , the variances and covariances of siblings reared at different densities (e.g., twins and singletons) or siblings of different degrees of genetic relatedness (e.g., mono‐ and dizygotic twins) may be compared. In the classical twin design , sibling interaction effects are suggested by a difference in phenotypic variance between mono‐ and dizygotic twins, and a pattern of twin correlations that is inconsistent with additive genetic influences.
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