Phys A L2

Phys A L2 - 4/10/2008 Physical Anthropology: Lecture 2...

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5/7/2009 Physical Anthropology: Lecture 2 (Chapter 1) I. Darwin’s Finches A. A number of our current disease states may be a result of recent evolutionary change in the environment 1. ie: The human body evolved from the Paleotithic environment B. Finches have evolved in response to the change in the environement, but will it continue? 1. Large beaks have disadvantages too 2. If beak size doesn’t change = equilibrium = stabilizing selection a) Stabilizing Selection b) Natural Selection 5 Basic Mechanisms for Evolutionary Change Mutation Genetic Drift Gene Flow Random Mating Natural Selection 3. Natural Selection can affect the population in 3 different ways/modes a) Depends on relationships between feature and fitness SELECTION MEAN TRAIT CHANGE VARIANCE CHANGE Stabilizing No change Decreases Directional Change No change Disruptive No change Increases 4. Evolution also has associations with negative effect (pleiotrophic) 5. Darwinian/Adaptationist Approach: the species is a dynamic population of individuals a) Characteristics of the species will be static over long periods of time, only if the most common type of individual is consistently favored by stabilizing selection 6. Individual Selection a) Adaptation that results from the competition among individuals and not between the entire population
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This note was uploaded on 04/08/2008 for the course ANTH 5 taught by Professor Gaulin during the Fall '07 term at UCSB.

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Phys A L2 - 4/10/2008 Physical Anthropology: Lecture 2...

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