01b evidence of evolution (7.4)

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01b evidence of evolution (7.4)

  1. 1. The Evidence for Evolution
  2. 2. Darwin’s Voyage – BBC 2009 • Part 1: • http://www.youtube.com/watch? v=ZtZb6GZgniI • Part 2: • http://www.youtube.com/watch? v=xGAVnbSW6kQ&feature=related
  3. 3. Evidence for Evolution • Types of evidence Darwin used to support his theory: – Biogeography – Homologous and analogous features – Vestigial features – Competition within populations
  4. 4. Biogeography + Darwin’s Observations
  5. 5. Key Observation from Galapagos Islands
  6. 6. Testing Darwin’s Hypotheses: Hawaiian Islands
  7. 7. Testing Darwin’s Hypotheses • When non-native mammals and amphibians introduced to islands, they have been able to thrive. This eliminates the possibility that they can’t survive on remote Dodo Bird Extinction within 175 islands. years – Mauritius Islands (Indian Ocean)
  8. 8. Homologous Features • Structures with common evolutionary features which serve different functions in modern species • Video on homology: http://www.youtube.com/watch?v=XgXT9sU6y18&feature=related http://www.xspore.com/community/drama/6876-evolution-vs-religion-4.html
  9. 9. Analogous Features • Structures that perform same function in two species but are not similar in origin or anatomy
  10. 10. Vestigial Features • Features that no longer serve the function they do in similar species http://paxarcana.wordpress.com/2009/08/25/your-appendix-mayactually-do-something/ http://rebeccamcc.blogspot.com / http://www.youtube.com/watch? v=lBkiT0zyYm0
  11. 11. Competition Within Populations • Thomas Malthus (Principle of Population) showed that all population are limited in size by the environment (food supply) Darwin’s thoughts: • All species produce more offspring than can survive to reproduce • This results in competition for resources between members of the same species • Environment might be favouring certain individuals
  12. 12. Homework  • Page 303 # 1,2,4-7

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