lecture15 - b. some variants contribute more offspring to...

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BioNB 221: Lecture 15 Oct. 1, 2008 Page 1 Lecture 15: Evidence for Behavioral Evolution Professor Kerry Shaw A. What makes a behavior? 1. Behavior is a gene by environment interaction (i.e. phenotype=genotype + environment) (genotype as filtered through development for example) 2. Behavioral variation: single genes vs. quantitative genetics B. If behavioral variation is at least partly genetic, behavior can evolve: 1. Only genetic differences among individuals contribute to evolutionary change because the differences caused by the environment are not passed to the offspring 2. Evolution occurs when a. individuals differ in some aspect of phenotype (e.g. behavior)
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Unformatted text preview: b. some variants contribute more offspring to next generation (by one of several processes) c. offspring resemble parents because part of variation is inherited d. consequently, the population starts to look more and more like the phenotype of the individuals that contribute more offspring C. Evidence for behavioral evolution D. How do behaviors evolve? 1. Change in motivation 2. Change in context 3. Change in frequency or duration 4. Change in form 5. Evolution of novel character 6. Loss of character BioNB 221: Lecture 15 Oct. 1, 2008 Page 2...
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lecture15 - b. some variants contribute more offspring to...

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