Evolution, Ecology and Behavior with Stephen C. Stearns - 5. How Selection Changes the Genetic Composition of Population

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27.3 hours of video
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Summary

Keywords

genetics gene frequencies heterozygous homozygous Hardy-Weinberg sexual asexual haploid diploid selection evolutionary rates meiosis

Full Transcript

Principles of Evolution, Ecology and Behavior (EEB 122) Genetics controls evolution. There are four major genetic systems, which are combinations of sexual/asexual and haploid/diploid. In all genetic systems, adaptive genetic change tends to start out slow, accelerate in the middle, and occur slowly at the end. Asexual haploids can change the fastest, while sexual diploids usually change the slowest. Gene frequencies in large populations only change if the population undergoes selection. 00:00 - Chapter 1. Introduction 05:45 - Chapter 2. History of Genetics 10:57 - Chapter 3. Different Genetic Systems 20:45 - Chapter 4. Math of Genetics 40:42 - Chapter 5. Rates of Change in Different Genetic Types Complete course materials are available at the Open Yale Courses website: http://open.yale.edu/courses This course was recorded in Spring 2009.