Chunk #8 — Introduction — Empirical Evidence for Additive and Non-Additive Genetic Variance — Laboratory Animals and Livestock

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Data and theory point to mainly additive genetic variance for complex traits.

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There are rarely good direct estimates of epistatic or dominance variance because these variance components are usually estimated from full-sibs and therefore confounded with the common environment shared by full sibs. However, if the heritability is high, the space for them is limited.