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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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Long-term Response: 1. Deterministic Aspects

Long-term Response: 1. Deterministic Aspects

Chapter:
(p.913) 25 Long-term Response: 1. Deterministic Aspects
Source:
Evolution and Selection of Quantitative Traits
Author(s):

Bruce Walsh

Michael Lynch

Publisher:
Oxford University Press
DOI:10.1093/oso/9780198830870.003.0025

In a large population in the absence of new mutation, selection is expected to eventually drive all of the additive-genetic variance in a trait toward zero, resulting in a selection limit. This chapter examines the underlying population-genetics of such a limit, how it is estimated, and reviews the actual nature of limits observed in artificial selection experiments. It also examines the conditions under which a major gene is more important than polygenic response.

Keywords:   adaptive walk, anthropogenically induced selection, Dudley's estimators, genetic architecture, exponential regressions, genetic homeostasis, Illinois long-term corn selection experiment, Lande's model, Lenski's long-term evolution experiment, polygenic balance, punctuated equilibrium, selection limit, synthetic lethals

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