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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 Variance: 2. Changes in the Environmental Variance

Short-term Changes in the Variance: 2. Changes in the Environmental Variance

(p.573) 17 Short-term Changes in the Variance: 2. Changes in the Environmental Variance
Evolution and Selection of Quantitative Traits

Bruce Walsh

Michael Lynch

Oxford University Press

While classical quantitative genetics usually assumes that all genotypes have the same environmental variance (the assumption of homoscedasticity), in reality, genotypes can show heteroscedasticity in the environmental variance. When such variation is heritable (i.e., has an additive variance in an outbred population), then the environmental variance can change under selection. This can either be due to an indirect response (such as during directional selection on a trait), or through direct selection to increase the homogeneity of a trait (such as for increased uniformity during harvesting). This chapter reviews the existing data on the heritability of the environmental variance and examines several different genetic models for predicting its response.

Keywords:   additive model, canalization, developmental noise, environmental sensitivity, environmental variance, exponential model, fluctuating asymmetry, genetic homeostasis, homoscedasticity, log-additive model, multiplicative model, repeated records

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