Cutter_Lecture_12 - QuantitativeTraitEvolution 1...

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Genetic correlations 1 Quantitative Trait Evolution
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Last time on quantitative (polygenic) traits… Narrow sense heritability Additive genetic variation Interactions between loci Epistasis Linkage disequilibrium Selection on quantitative traits Selection differential, Response to selection Breeder’s equation Laboratory experiments Selection in nature Neutrality of quantitative traits 2
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Correlated trait evolution Observation: Evolutionary changes in one trait often are correlated with changes in other traits Causes: 1. Correlated selection on the traits Genetic variation in all of the traits Some combinations of trait values favored by selection more than others E.g. stripes AND crawl straight vs. spots AND reverse course 2. Genetic correlation among the traits 3
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Genetic correlations Two potential causes of genetic correlations between different traits 1. Linkage disequilibrium : different genes affect distinct traits, but they are physically close together and have non random multi locus genotypes Alleles at locus A are correlated non randomly with alleles at locus B 2. Pleiotropy : the same gene affects multiple traits 4
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Genetic correlations In wild radish ( Raphanus
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Cutter_Lecture_12 - QuantitativeTraitEvolution 1...

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