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Evolution and Selection of Quantitative Traits$
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Bruce Walsh and Michael Lynch

Print publication date: 2018

Print ISBN-13: 9780198830870

Published to Oxford Scholarship Online: September 2018

DOI: 10.1093/oso/9780198830870.001.0001

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Changes in Genetic Variation Induced by Drift

Changes in Genetic Variation Induced by Drift

(p.391) 11 Changes in Genetic Variation Induced by Drift
Evolution and Selection of Quantitative Traits

Bruce Walsh

Michael Lynch

Oxford University Press

In the absence of the input of new variation, drift eventually removes all of the additive-genetic variance in a population. When nonadditive genetic variance is present, some of this variation can be transiently converted into additive variance, resulting in the latter occasionally increasingly (for a time) under inbreeding. This chapter examines the conditions under which such a conversion can occur, which leads to a discussion of the more complex covariances between inbred relatives, requiring the introduction of several new genetic-variance components to be introduced. It also examines the expected equilibrium levels of additive variance under drift-mutation equilibrium.

Keywords:   additive variance, covariance between inbred relatives, drift, mutational heritability, mutation-drift equilibrium, nonadditive genetic variance, one- and two-locus identity coefficients, polygenic mutation, REML estimates

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