BIO 3122 Lecture 11: Lecture 11 - Quantitative traits
8 Nov 2017
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Document Summary
Study traits influenced by many genes, not a single locus. Phenotypic variance in a population level for a given trait. Components of phenotypic variance are able to respond to selection. How can we predict and measure response of a population to selection. Classic examples of quantitative traits under natural selection. Polygenic trait - influenced by many genetic loci. Quantitative genetics - study of genetic mechs of continuous phenotypic traits. Noticed how light sub species lived on light beaches and dark subspecies lived in darker woodlands. House mouse coat colours is a quantitative trait. Hundreds of thousand of genes involved, many loci. Very difficult to due with more alleles so it"s not used. With the same mean value, these traits differ only in terms of their variance. Proportion of the population that falls close to the mean differ. Discrete - falls under category, presence or absence. In perfect --> no curve, just straight line across.
