"Lec 8 - The Expression of Variation: Reaction Norms" Principles of Evolution, Ecology and Behavior (EEB 122) Reaction norms depict the range of phenotypes a single genotype can produce, depending on the environment. Reaction norms must fit within an organism's phylogenetic constraints. They can differ for different individuals within a population, but some traits differ very little based on the environment; some do not differ at all. 00:00 - Chapter 1. Introduction 03:22 - Chapter 2. Reaction Norms 12:10 - Chapter 3. Reaction Norms in Populations 23:42 - Chapter 4. Developmental Constraints on Reaction Norms 36:23 - Chapter 5. Benefits and Limitations of Studying Reaction Norms Complete course materials are available at the Open Yale Courses website: http://open.yale.edu/courses This course was recorded in Spring 2009.
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