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Evidence for Evolution Webquest Overview: You will explore the following pieces of evidence: 1. Homologous Structures Definition of “Homology”: 2. Embryological Development Definition: 3. Biogeography Definition: 4. DNA & Molecular Biology 5. Fossil Evidence 6. Artificial Selection Definition: A live link for this WebQuest can be found on my website. Begin at Berkeley’s “Understanding Evolution” site: http://evolution.berkeley.edu/evolibrary/article/0_0_0/lines_01 1. List the 4 different lines of evidence: a. b. c. d. A. Fossils: Click on “Fossil Evidence”. 2. What clues do fossils provide? Click on “Next”. 3. What are transitional forms? 4. Describe 1 example: B. Homologies. Click on “Next”. 5. What does evolutionary theory predict (hypothesize)? 6. How can homologies be revealed? 7. Describe an example. 8. Why are the forelimbs of frogs, rabbits, birds, and other tetrapods (4-limbed animals, including us!) considered homologous structures, even though they look so different? Click on “Next”. 9. What are vestigial organs? 10. Give an example. Click on “Next”. 11. What is comparative anatomy? 12. Give an example. C. Embryological Development. Click on “Next.” 13. What occurs during some stages of development? 14. What is the evidence that supports the hypothesis: snakes had ancestors with legs? 15. What is the evidence that supports the hypothesis: baleen whales had ancestors with teeth? D. DNA Evidence. Click on “Next”. 16. One componenet of the Cell Theory (which you learned last semester) is that all organisms are made of cells. How does this statement provide evidence for the theory of evolution: all living organisms share a common ancestor? 17. What do different species share besides common anatomies? 18. What shares ¼ of its genes with humans? 19. How is the DNA code itself a homology? E. Human Evolution—“How we Became Human”: Now, go to a fascinating website on how humans evolved from the Smithsonian: http://humanorigins.si.edu/evidence 20. What are some pieces of evidence for human evolution? List 3. a. b. c. Click on “Behavior”. 21. Why do you think stone handaxes are evidence of early human behavior? Click on one of the categories. Choose from: Art & Music, Making Clothing, Recording Information, Burial, Carrying & Storing, Hearths & Shelters, Stone Tools, Getting Food, Primate Behavior, & Footprints. 22. What are 3 things you learned? a. b. c. 23. How do these things relate to human evolution? What adaptations evolved? Click on “Human Fossils”. 24. What are some things we can learn from early human fossils? (List 3) a. b. c. Click on “Species” (left hand side-bar). Click on 2 different species. 25. What were their names? a. b. 26. How long ago did they live? a. b. *(Extra Credit 3-5 pts): Draw a picture of 1 of them. Click on “Genetics” (left side-bar). Read the article. 27. What does the amount of difference between DNA sequences in different species show? 28. What is the amount of difference between yourself and every other human being on this planet? 29. How different is our DNA from that of a chimpanzee’s? Click on “Human Skin Color Variation” (left side bar). Click on “Diversity—Skin Color” 30. Why do people from different parts of the world have different skin color? On the sidebar, under “Genetics”, click on “One Species, Living Worldwide”. 31. What species do we all belong to? 32. Where did the earliest humans evolve from? Summary: What are 3 pieces of evidence that support the theory of evolution? Use at least 3 complete sentences. (1 extra credit point per extra sentence).