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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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Short-term Changes in the Mean: 3. Permanent Versus Transient Response

Short-term Changes in the Mean: 3. Permanent Versus Transient Response

(p.525) 15 Short-term Changes in the Mean: 3. Permanent Versus Transient Response
Evolution and Selection of Quantitative Traits

Bruce Walsh

Michael Lynch

Oxford University Press

In a variety of settings—additive epistasis in a diploid, dominance in an autotetraploids, shared environmental effects (such as epigenetic contributions), maternal effects, and dominance under inbreeding—the response in the mean has both a permanent and a transient component. The latter arises because selection perturbs the population distribution of genotypes away from their Hardy-Weinberg values. Upon the cessation of selection, any change in allele frequencies remains, but any additional changes due to departures from Hardy-Weinberg decay away. The result is that, even in the presence of these transient components, the breeder's equation often accurately predicts the amount of permanent response.

Keywords:   ancestral regression, cross-generation covariance, Dickerson-Willham model, epigenetics, evolutionary momentum, Falconer's dilution model, Griffing effect, maternal effects, maternal inheritance, maternal selection, permanent response, reversed response, shared environmental effect, transient response

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