Chapter

The Population Genetics of Selection

Bruce Walsh and Michael Lynch

in Evolution and Selection of Quantitative Traits

Published in print July 2018 | ISBN: 9780198830870
Published online September 2018 | e-ISBN: 9780191868986 | DOI: https://dx.doi.org/10.1093/oso/9780198830870.003.0005
The Population Genetics of Selection

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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

Chapter.  18738 words.  Illustrated.

Subjects: Evolutionary Biology ; Biochemistry

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