Class 32 - Heritability and complex traits 1 Summary from...

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Heritability and complex traits 1
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Summary from last class Complex traits are polygenic No single gene controls the entire trait More genes give greater variability Genes may have + or - effects Distribution of the trait is “normal” Environment has important moderating effects 2
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Selective breeding Unlike specific discrete traits like coat color, most animal traits are complex Since no single gene controls these, only long-term breeding by selection and interbreeding can be effective 3
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Selective Breeding In selective breeding start with individuals with desirable traits, cross sibs, select most desirable progeny, cross sibs, etc. This will result in homozygous positive traits to be enriched at each generation but takes alot of time In humans called eugenics!
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How to assess genes vs. environment in a phenotype “Too bad Johnny uses so much meth - but not so surprising since is brother is such a speed freak.” Is addiction due to genes or environment? A.Genes B.Environment C.Both D.Neither 6
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Scientific approach to Nature vs Nurture Try to hold environment constant and allow genes to vary Compare variation of phenotype among genetically varying individuals Try to hold genes constant and vary environment Compare phenotypic variation among genetically identical individuals 7
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