2-23-09 - Part II Lecture One Adaptation Traits that arise...

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Part II Lecture One: Adaptation - Traits that arise as a result of natural selection are called adaptations - Natural Selection: increases or decreases fitness of a phenotype, relative to other phenotypes, in a given environment - Adaptation: increases fitness Adaptation, defined by George Williams (1966) - “does something” for an organism o 1. It fulfills a specific function, not fulfilled by any other traits o 2. It does this with “precision, economy, efficiency” o 3. Its relationship, or “fit”, between the organism & its environment cannot be explained by chance Adaptation - Is also The Process by which these traits are selected for in a population, increasing fitness of particular phenotypes over time in that environment The Red Queen Hypothesis: Leigh Van Valen in 1973 - Described relationship between evolution, natural selection and adaptation - Through the Looking Glass - Adaptation: Running in place Why do species become extinct? -
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2-23-09 - Part II Lecture One Adaptation Traits that arise...

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