StudyQuestions_Week8 - Biology 180 Week 8 Study Questions...

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Biology 180: Week 8 Study Questions Autumn 2011 Does 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 (respectfully) 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); one as challenger (making sure that all ideas are carefully considered). Format: 1 Each person should write answers to the first 4 questions on their own, in 15 minutes or less (these questions would be worth about 35 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 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. Consider sexual selection. • Define the fundamental asymmetry of sex. In many species of fungi, sexual reproduction occurs but gametes are never produced—cells that are part of the normal body of different individuals merge and their nuclei fuse to form a zygote. Can sexual selection occur in these species? Explain your reasoning. 2. Consider consumption. a. Alder (a tree species with nitrogen fixing bacteria), has a carbon to nitrogen (C:N) ratio of 19:1. Willow and poplar, which do not have N fixing bacteria, have C:N ratios of 26:1 and 42:1, respectively. If caterpillars are given a choice of eating alder, willow, or poplar, predict the order of species they prefer. Explain why. b. Recall the mussels in Maine preyed on by crabs. Suppose mussels from high predation (HP) and low predation (LP) areas of the same bay are swapped (via transplantation at “Start”). Make bar graphs showing the predicted results if average shell thickness, relative to overall body size, is measured 2 years later (“End”) on the transplanted individuals. c. Predict what the offspring (“O”) of the “End:LP” parents will look like in terms of relative shell thickness, if they end up growing in the array of habitats indicated (here NP = no predation). Start: HP End:LP Start: LP End:HP Parent O in HP “End:LP” O in LP O in NP
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3. Adenoviruses cause colds. You want to test the hypotheses that 1) adenoviruses induce sneezing in humans to increase their chance of being transmitted to uninfected people, 2) infected hosts sneeze to rid themselves of adenoviruses, and 3) sneezing has nothing to do with viral infection. You have a drug that inhibits sneezing, so you can compare large, random samples of sneezers versus non-sneezers. What you will measure:
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StudyQuestions_Week8 - Biology 180 Week 8 Study Questions...

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