lecture12 - BioEE 278 Evolutionary Biology Fall 2007...

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BioEE 278 Fall 2007 Evolutionary Biology Lecture 12 THE GENETIC BASIS OF TRAITS & PATTERNS OF VARIATION TEXT READING: Chapter 9, pp. 189-192, 199-210, 212 (bottom) -222; ignore figures 9.18 – 9.21 & Boxes 9A, B & C) A. Phenotype and genotype revisited. 1. Evolutionary biologists are interested in variation in both phenotype and genotype. 2. Types of phenotypic variation. a. discrete polymorphisms can represent traits affected by a single (or few) major gene(s), but also can be the result of threshold responses in development b. continuous variation results when a trait is influenced by many genes (each perhaps of small effect) - such traits are referred to as polygenic c. continuous variation may also reflect the influence of environment B. Approaches to understanding the genetics of evolutionary change. 1. Population genetics. a. explains evolutionary change in terms of changes in the frequencies of alleles and genotypes (at one or a few gene loci) b. predict allele or genotype frequencies in generation (t+1) from those in
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lecture12 - BioEE 278 Evolutionary Biology Fall 2007...

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