Lecture3_NaturalSelection

Lecture3_NaturalSelection - Evolution by Natural Selection...

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I. Evolution by natural selection Charles Darwin Pattern = Process = How does evolution by natural selection occur? A. Darwin’s four postulates 1. Individuals within populations are 2. Some of these variations are 3. Not all offspring live to reproduce or produce the 4. Only individuals with certain As a result, evolution occurs = the characteristics of the B. Current view of evolution by natural selection Distill the four postulates to their essence: 1) Heritable that leads to …. 2) Differential Increased focus on Define evolution = a change in the characteristics of a population over time C. An example of natural selection in action: The evolution of drug resistance in HIV HIV = Human immunodeficiency virus The pathogen responsible for AIDS (acquired immune deficiency syndrome) HIV infects immune system cells, takes cells over and replicates inside, killing host cell in process Number dead to date: over million ( million in 2005) Number currently infected:
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Lecture3_NaturalSelection - Evolution by Natural Selection...

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