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Evolution powerpoint

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Evolution powerpoint

  1. 1. EVOLUTION
  2. 2. Evolution <ul><li>Change over time </li></ul><ul><li>Occurs to species, not individual </li></ul><ul><li>Explains diversity on Earth today </li></ul>
  3. 3. Diversity <ul><li>Great variety of types of living things </li></ul><ul><li>Between species </li></ul><ul><ul><li>10 – 100 million species on earth </li></ul></ul><ul><li>Within a species </li></ul><ul><li>Result of evolution </li></ul>
  4. 4. Diversity
  5. 5. Diversity bacteria phytoplankton zooplankton
  6. 6. Diversity sponges mollusks
  7. 7. Diversity echinoderms
  8. 8. Diversity
  9. 9. Evolutionary Tree
  10. 10. How Evolution Works <ul><li>Explained by Charles Darwin and Alfred Russell Wallace </li></ul><ul><li>Darwin wrote On </li></ul><ul><li>the Origin of Species </li></ul>
  11. 11. How Evolution Works <ul><li>Darwin visited Galapagos Islands on HMS Beagle </li></ul>
  12. 12. How Evolution Works <ul><li>Overpopulation </li></ul><ul><li>more individuals born than can survive </li></ul>
  13. 13. How Evolution Works <ul><li>2. Competition </li></ul><ul><li>for limited resources </li></ul><ul><li>some will survive, some will not </li></ul>
  14. 14. How Evolution Works <ul><li>3. Variation </li></ul><ul><li>differences among individuals </li></ul><ul><li>a result of genetic </li></ul><ul><li>mutation – changes in </li></ul><ul><li>DNA </li></ul>
  15. 15. How Evolution Works <ul><li>4. Adaptation </li></ul><ul><li>some variation gives some individuals a slight survival advantage </li></ul><ul><li>these are favorable traits </li></ul>
  16. 16. How Evolution Works <ul><li>5. Natural Selection </li></ul><ul><li>those with best traits survive, reproduce and pass favorable traits on to their offspring </li></ul><ul><li>the mechanism of evolution </li></ul>
  17. 17. natural selection resulting in reduced armor in sticklebacks
  18. 18. How Evolution Works <ul><li>6. Speciation </li></ul><ul><li>changes build up and the species changes over time </li></ul>
  19. 19. Adaptations <ul><li>traits or characteristics that help an organism survive in its ecosystem </li></ul><ul><li>three types: </li></ul>
  20. 20. Adaptations <ul><li>Structural </li></ul><ul><li>- physical structure that </li></ul><ul><li>helps organism survive </li></ul>
  21. 21. Adaptations <ul><li>2. chemical </li></ul><ul><li>- chemical that helps organism survive </li></ul>
  22. 22. Adaptations <ul><li>3. behavioral </li></ul><ul><li>- behavior that helps </li></ul><ul><li>organism survive </li></ul>
  23. 23. Adaptations <ul><li>Camouflage </li></ul><ul><li>Allows an organism to blend with its environment </li></ul>
  24. 24. Adaptations <ul><li>Warning Coloration </li></ul><ul><li>bright colors make an organism easily recognized </li></ul>
  25. 25. Adaptations <ul><li>Mimicry </li></ul><ul><li>one species is protected by resembling another species or part of an organism </li></ul>flatworm (right) mimicing a toxic nudibranch (left)
  26. 26. Isolation <ul><li>if one part of a population is separated or isolated from another, speciation is more likely </li></ul>
  27. 27. Isolation
  28. 28. <ul><li>Through the process of evolution by natural selection we have the great diversity of organisms that inhabit the Earth today. </li></ul>
  29. 29. <ul><li>For the rest of the school year we will be examining the results of evolution. We will study the adaptations of marine organisms and how they evolved over the 3.7 billion years that there has been life on Earth. </li></ul>

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