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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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Selection Under Inbreeding

Selection Under Inbreeding

(p.825) 23 Selection Under Inbreeding
Evolution and Selection of Quantitative Traits

Bruce Walsh

Michael Lynch

Oxford University Press

When dominance is presence, the selection response equations under inbreeding can become rather complex, they require additional variance components beyond the additive-genetic variance. Further, both transient and permanent components of response can arise. This chapter examines the theory of both the covariance of relatives under general inbreeding, as well as the expected selection response under inbreeding. Due to the decrease in the effective recombination rate under selfing, the Bulmer effect can be rather dramatic, as any linkage disequilibrium generated by selection is only weakly removed by recombination. Finally, this chapter also examines the evolutionary forces that interact to determine the selfing rate for a given population.

Keywords:   ancestral regressions, automatic selection, Baker's law, Bulmer effect, covariance between inbred relatives, directional dominance, evolution of selfing rates, inbreeding depression, Kelly's structured linear model, Lande-Schemske model, partial selfing, reproductive assurance, selfing, selfing as an evolutionary dead end hypothesis

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