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Evidence for Evolution Webquest Fossils 1. What is a fossil? ___________________________________________________ ___________________________________________________ Watch: http://ed.ted.com/lessons/how-to-fossilize-yourselfphoebe-a-cohen Look at: http://teacher.scholastic.com/scholasticnews/magazines/sciencewor ld/assets/SW-POWERPOINT-FOSSILS.ppt 2. What are three ways an organism can fossilize? 1. 2. 3. Interactivity: http://www.burkemuseum.org/static/burke_boxes_materials/fossils/int eractive/01_fossils.html Click “Enter” Click “Build a Mammoth” 3. Compare the bones of the mammoth to the bones of the horse in the lower left corner. How can fossils help us understand the evolution of a species? ___________________________________________________ ___________________________________________________ ___________________________________________________ ___________________________________________________ Homologous Structures Interactivity: http://evolution.berkeley.edu/evolibrary/article/similarity_ms_01 4. Define homology: ___________________________________________________ ___________________________________________________ Complete the interactive “The tale of the limb.” Take a look at the diagrams of front limbs presented on the webpage. Each is from a different animal. In each grouping you see, you should select the limb that doesn't belong, and take note of the similarities that the others share. 3. Animals with four legs are called ______________________. 4. List the similarities that tetrapod limbs share: A. B. 5. Complete the interactive. Name the four organisms the tetrapod homologous limbs belong to: A. C. B. D. 6. Why do whales, lizards, humans, and birds have the same basic limb structures? ___________________________________________________ ___________________________________________________ 7. What does an evolutionary tree show? ______________________________________________________ ______________________________________________________ 8. What are homologous structures? ______________________________________________________ ______________________________________________________ 9. List examples of homologous structures found in nature. A. C. B. D. 10. Use BEYOND THE OBVIOUS page to answer the following question. Do all homologous structures look alike? Why or Why not? _________________________________________________________ _________________________________________________________ Analyzing Amino Acid Sequences *Go to my webpage. *Under class notes click on “Analyzing Amino Acid Sequences.” 11. What is the purpose of analyzing amino acid sequences? _________________________________________________________ _________________________________________________________ 12. How is this method of determine evolutionary relationships different than the ones we have talked about so far _________________________________________________________ _________________________________________________________ 13. Click on the next slide and determine how many differences exist between a human and a shark for this particular protein. ___________ 14. How many differences exist between the human and monkey? ___ Watch: https://www.youtube.com/watch?v=lIEoO5KdPvg List additional evidence for evolution here: 1.____________________________________________________ 2.____________________________________________________ 3.____________________________________________________ 4.____________________________________________________ 5.____________________________________________________