2-11-09 - 2/11/09 Complex, Or Quantitative, Traits...

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Complex, Or Quantitative, Traits Quantitative Traits o Vary continuously o Additive effects of different alleles o Polygenic : multiple minor genes influence phenotypic outcome of major genes o Expression of traits is influenced strongly by the environment o Polygenic traits: multiple genes affect a single trait Eye color – continuous variation Height - a quantitative, polygenic trait – continuous distribution: the measurement of variance Obesity: “the mouse on the left needs leptin” A plygenic, complex trait Complex trait: multiple genes, plus environment Lecture 7: the evolutionary mechnisms The modern synthesis (1936 – 1947) o The integration of genetics & Darwinian theory into a single coherent theory of evolution o Julian Huxley, 1942 Evolution defined as changes in gene frequencies o Macroevolution occurs as a result of microevolution o Microevolution Change in gene frequencies in a population from generation to generation
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2-11-09 - 2/11/09 Complex, Or Quantitative, Traits...

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