Unit 3 Outline Complete

Unit 3 Outline Complete - Unit III Evolution/Diversity...

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Unit III Evolution/Diversity Baron Georges Cuvier: realized that through fossils species become extinct, believed that life was older than interpretation in genesis, called on at least 4 catastrophes, the great flood was the last Sir Charles Lyell: Theory of Uniformity: gradual repetitive changes shaped the earth, earth not static and was millions of years old not 6,000, thought maybe these gradual changes happened with humans too Jean Baptiste Lamarck : inheritance of acquired characteristics(if giraffe constantly stretched neck then they would pass it on to kids), realized that living species change over time just did not get the mechanism correct Thomas Malthus : economist, concluded that human pop. Could not gow exponentially bc of limitedresources, contributed to Darwin’s natural selection Alfred Wallace: worked in Indonesia he independently came up with the same natural selection ideas of Darwin, Wallace pushed Darwin to stop thinking and publish his ideas bc Wallace sent him his info so published at same time Processes of Evolution In 17 th , 18 th century Europe—almost everyone believed in Creationism and that the earth was 6,000 years old (which was worked out as an estimate by Archbishop James Ussher in 1650). I. Natural Selection (NS) “Descent with modification” A. 3 key observations by Darwin: 1. Species tend to:overproduce, superfecundity(super fertility) ability of a species to produce more offspring than the environment can support 2. Individuals in a population:vary extensively 3. Many varying traits:were inherited B. Conclusion – the varied traits that an individual inherits affects this individual’s ability to:secure limited resources, to better survive and reproduce in particular environments Traits that are “better” than others for a particular environment become: more prevalent in future generations(micro-evolution) “differential reproductive success” C. Darwin’s theory (published book: 1859 Origin of Species)- Diverse forms of life have arisen: From ancestral species by natural selection “desecent with modification”
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D. Natural Selection (NS) = differential reproductive succes____. In other words, individuals whose characteristics best adapt them to their CURRENT environment are most likely to ________survive and reproduce and pass along their genes______________________. 1. Successful or “fit” individual = one that survives and passes along his genes 2. Example of NS that has occurred: camouflage, DNA sequences allow it to be more fit so it gets selected for or selected against 3. Example of NS in action :insecticide Resistance DDT used around WWII to wipe out mosquitos(malaria) and lice (typhus) World Health Organization estimates that 25 million lives were saved BUT insects became resistant to DDT Resistance=microevolution Chromosome with red gene when all have green because this one is resistant to insecticide, that one keeps reproducing so application of insecticide keeps losing effectiveness-
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This note was uploaded on 02/16/2009 for the course BIOL 101 taught by Professor Hogan during the Spring '08 term at UNC.

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Unit 3 Outline Complete - Unit III Evolution/Diversity...

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