Edu290 part 1 evolution and biodiversity

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Edu290 part 1 evolution and biodiversity

  1. 1. Evolution and Bio-Diversity• Survival and Extinction• Theory of Evolution• Natural Selection
  2. 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. 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. 4. Survival and ExtinctionRemoval of genes from gene pool
  5. 5. Survival and ExtinctionFossil RecordsMajority of species are extinctGive us insight to Earth’s history
  6. 6. Survival and Extinction Fossil Records Continued Displays how species have evolvedIvanWalsh, Fossilsand Dinosaurs fromBeijingMuseum, December5, 2009, CreativeCommons License
  7. 7. EvolutionEvolution Definition Any change across successive generations in the heritable characteristics of biological populations
  8. 8. Evolution Charles Darwin Created his own theory of evolution All species from common ancestry Branching pattern of evolution - natural selection
  9. 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. 10. Evolution Best displayed through comparisons of: Fossils Modern species Changes are displayed in different ways
  11. 11. Evolution Natural Selection Provides a mechanism for evolution Process to explain evolution
  12. 12. Natural SelectionThe gradual non-random process through which biological traits become more or less common in a population
  13. 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. 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. 15. Natural Selection Geographic Isolation A species is physically separated Plays important role in evolution Two diverse groups form
  16. 16. Natural SelectionEnvironmental FactorsNew predators or preyLow food supplyFinite resources

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