lecture16 - BioEE 278 Evolutionary Biology EVOLUTION OF...

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BioEE 278 Fall 2007 Evolutionary Biology Lecture 16 EVOLUTION OF PHENOTYPIC TRAITS Reading: Ch. 9, pp. 207-212,; Ch. 13, pp. 298-303 (top), 304-310 A. Quantitative genetics approaches to understanding evolutionary change 1. Many traits of evolutionary significance are polygenic. a. examples include body size, growth rate, number of offspring produced, age of first reproduction (all of which presumably contribute to "fitness") b. Example of 6 loci: multiple genotypes produce same phenotpye 2. Concerned with continuously varying and/or meristic (countable) traits. a. explain evolutionary change in terms of changes in the mean and variance b. variance [=1/(n-1) Σ (x i -x) 2 ] is a measure of how far (on average) the individual values are from the mean c. partition phenotypic variation into genetic and environmental components d. partition genetic variation into additive (V A ), dominance (V D ), and interaction (epistatic) variance ((V I ) e. V A most important to evolutionary change f. interested in relative magnitudes of V
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This note was uploaded on 09/28/2008 for the course BIOEE 2780 taught by Professor Geber during the Fall '07 term at Cornell University (Engineering School).

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lecture16 - BioEE 278 Evolutionary Biology EVOLUTION OF...

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