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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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The Population Genetics of Selection

The Population Genetics of Selection

(p.113) 5 The Population Genetics of Selection
Evolution and Selection of Quantitative Traits

Bruce Walsh

Michael Lynch

Oxford University Press

This chapter examines models of one- and two-locus selection in the absence of drift and mutation. Expressions for the per-generation rate of allele-frequency change and the expected time for a specified amount of change are developed for single-locus models, and their equilibrium structure is examined for those settings where selection retains more than one allele. The presence of selection-generated linkage disequilibrium greatly complicates the extension of single-locus results to two loci, and the chapter examines some of the resulting complications. Finally, it examines the nature of selection on a locus that underlies a trait under selection, and then uses this to develop the breeder's equation for the single-generation response in a trait under selection. One important result is that the loci for a trait under stabilizing selection experience fitness underdominance, and thus trait selection removes, rather than retains, genetic variation.

Keywords:   adaptive topography, basins of attraction, breeder's equation, marginal fitnesses, multiple-locus selection, overdominance, sexual selection, single-locus selection, stability analysis, stabilizing selection, underdominance, Wright's Formula

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