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Edu290 part 1 evolution and biodiversity
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Edu290 part 1 evolution and biodiversity

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  • 1. Evolution and Bio-Diversity• Survival and Extinction• Theory of Evolution• Natural Selection
  • 2. Survival and ExtinctionSpecies – A group of living organismsconsisting of smaller individuals capable ofinterbreeding and exchanging genes.Extinct EndangeredSpecies Species•Baji Dolphin •Siberian Tiger •West African Black Rhino MDPettitt, Siberian Tiger, July 17, 2008, Creative Commons License
  • 3. Survival and ExtinctionPopulation – A group of organisms of one species that interbreed and live in the same place at the same time. Example: Deer PopulationLoneTown, Deer ‘White Tail Deer’,February 20, 2011, CreativeCommons License
  • 4. Survival and ExtinctionRemoval of genes from gene pool
  • 5. Survival and ExtinctionFossil RecordsMajority of species are extinctGive us insight to Earth’s history
  • 6. Survival and Extinction Fossil Records Continued Displays how species have evolvedIvanWalsh, Fossilsand Dinosaurs fromBeijingMuseum, December5, 2009, CreativeCommons License
  • 7. EvolutionEvolution Definition Any change across successive generations in the heritable characteristics of biological populations
  • 8. Evolution Charles Darwin Created his own theory of evolution All species from common ancestry Branching pattern of evolution - natural selection
  • 9. Evolution Darwin’s Theory of Natural Selection Differential Survival Essential to Darwin’s theory Limited quantities of space and resources Those most fit will survive
  • 10. Evolution Best displayed through comparisons of: Fossils Modern species Changes are displayed in different ways
  • 11. Evolution Natural Selection Provides a mechanism for evolution Process to explain evolution
  • 12. Natural SelectionThe gradual non-random process through which biological traits become more or less common in a population
  • 13. Natural Selection How it works Traits are passed down generations Beneficial traits are passed on Negative traits disappear Important traits are traits that: Benefit reproduction and/or survival
  • 14. Natural Selection  Mutations  Some diversity comes from mutations  Beneficial mutations are passed on  Mutations can become part of genes  Example: Giraffes’ long necksJRobertMoore, Giraffe, January13, 2007, Creative Commons License
  • 15. Natural Selection Geographic Isolation A species is physically separated Plays important role in evolution Two diverse groups form
  • 16. Natural SelectionEnvironmental FactorsNew predators or preyLow food supplyFinite resources