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StudyQuestions_Week5 - Biology 180 Week 5 Study Questions...

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1 Biology 180 Week 5 Study Questions Spring 2010 Do these questions with your study group (~4 people). Follow these rules: Everyone must participate in every question that you work on. Listen to each person’s contributions. At least once during each study session, each group member should challenge another member’s ideas. Assign roles: If your group isn’t part of a large session at CLUE or Tribeta or the IC, one person should serve as timekeeper; one as organizer (keeping people on task and getting a consensus on when to move on to the next question for discussion); one as group-dynamics checker (making sure everyone is heard and respectful); one as challenger (making sure that all ideas are carefully considered). Format: 1. Each person should write answers to the first 5 questions on their own, in 30 minutes or less (these questions would be worth about 50 points on an exam). 2. Discuss each question (3 minutes each). 3. Exchange papers and use the answer key on p3 to grade each other for full credit, partial credit, or no credit (1 minute each). 4. Read through the rest of the question list. Each person should decide which question they want to work on most (meaning that they are LEAST confident about). 5. Go through the rest of the questions, taking turns to decide which to discuss next. 6. Each member of the group should write 2 exam questions, based on key concepts from this week, identified in your weekly notes summary. Use these questions to quiz each other. 1. The landmass called Central America arose about 3 mya. Prior to this event, the Atlantic and Pacific Oceans were continuous in the region and there were several species of snapping shrimp present. Three of these species ( AP1 , AP2 , and AP3 ) are shown on the phylogeny to the right. Once Central America had separated the Atlantic and Pacific, distinct species evolved on either side. Species called A1 and P1 evolved from AP1 ; species A2 and P2 evolved from AP2 , and species A3 and P3 evolved from AP3 . In the space to the right, draw the phylogeny of the 6 derived species. On your tree, label the node that represents species AP2 . Was this an example of vicariance, dispersal, or sympatric speciation? Explain why A1 and P1 have diverged, in terms of their genetic and morphological characteristics. AP AP AP
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2 2. Consider data on the evolution of whales. a. Are the two trees the same or different? b. According to the tree on the right, which species is most closely related to Indohyus : Ambulocetus or Delphinapterus ? c. The synapomorphy that identifies whales as a monophyletic group is an unusual ear bone. All of the species pictured have this bone. On the tree to the right, mark and label the origin of “Whale ear bone.” d. Hippos do not have this unusual ear bone. On the tree to the right, add hippos.
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