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B1510F07_L03EvolIntro_LP

B1510F07_L03EvolIntro_LP - Georgia Tech School of Biology...

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Biology 1510 Georgia Tech School of Biology Fall 2007 Module 1:  Evolution • Major themes – What is life? – Earth history – Origin of life – Evolution and history of life – Mechanisms of evolution – Speciation
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Biology 1510 Georgia Tech School of Biology Fall 2007 What is Life? • Features of living organisms: – Homeostasis – Metabolism – Reproduction (with variation) – Information (genetic) – Evolution • Typical definition:  “an organized genetic  unit capable of metabolism, reproduction,  and evolution”.
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Biology 1510 Georgia Tech School of Biology Fall 2007 Biological Evolution • In 1858, Charles Darwin and Alfred Russell  Wallace simultaneously published volumes  describing the fundamental mechanism of  evolution through natural selection. – Differential survival and reproductive success  of individuals leads to bias in the propagation  of genetic information from one generation to  the next.   (i.e., species can change) – Acting over time, selection can alter the genetic  composition of a population, leading to changes  in structure, function, behavior, etc.  (i.e.,  adaptation)
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Biology 1510 Georgia Tech School of Biology Fall 2007 Mechanism of Natural Selection Population of organisms Hereditary variations Differences in reproductive success Evolution of adaptations in the population Overproduction and struggle for existence Figure 1.20 Campbell & Reece, Fig. 1.20
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Biology 1510 Georgia Tech School of Biology Fall 2007 Darwin’s “Tree of Life”
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Biology 1510 Georgia Tech School of Biology Fall 2007 Darwin’s “Tree of Life”
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