poul_lecture_2 - Lecture 2: Evolution Through Natural...

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Lecture 2: Evolution Through Natural Selection Quick review of evolution through natural selection: 2 mechanisms for evolution: Drift – chance events, sampling error Natural Selection – survival of the fittest Important assumptions associated with natural selection: - Individuals vary - Heritable component to variation - Individuals with certain attributes survive and reproduce better than others THEORETICAL EXAMPLE – bird color is selected for according to background environment. Can lead to new species altogether. REAL-LIFE EXAMPLE – salamanders in California (video clip) Selection for traits can be stimulated through survival, but natural selection is not, by definition, survival itself. The important component here is fitness: Fitness: the likelihood of producing offspring that will survive to reproduce Natural selection can also act when a trait increases reproductive success. EXAMPLE – REPRODUCTIVE SELECTION – black-headed gull example Take-home message! Natural selection can occur through methods that allow an animal
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This note was uploaded on 04/08/2011 for the course POUL 3123 taught by Professor Navara during the Spring '09 term at University of Georgia Athens.

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poul_lecture_2 - Lecture 2: Evolution Through Natural...

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