StudyQuestions_Week7 - Biology 180: Week 7 Study Questions...

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Biology 180: Week 7 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 5 questions on their own, in 20 minutes or less (these questions would be worth about 40 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. Several lines of evidence suggest that a 10-km wide asteroid hit the Earth about 65 million years ago. • Which piece of evidence do you find most convincing, and why? • Why would the impact event have resulted in the extinction of large numbers of species? • Which region of the world should have experienced the highest extinction rates, and why? 2. a. State a hypothesis to explain the adaptive significance of the following traits and map them on the tree. Pollen Embryophyte condition Cuticle b. How would you test your hypothesis about cuticle? Assume that you have some mutant moss where cuticle does not form. Chara Liverworts Mosses Hornworts Lycophyta Horsetails Ferns Gymnosperms Angiosperms
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3. a. State the adaptive significance of the following traits. Bilateral symmetry Coelom Epithelial (“skin”) tissue b. How would you test your hypothesis about epithelium? Assume you have some mutant sponges where epithelium does not form. 4. Consider the evolution of land plants. Vessels evolved in gnetophytes and angiosperms. If researchers were able to identify the genes responsible for vessel formation in both groups, state the predictions made by the following hypotheses: Angiosperm and gnetophyte vessels are homologous: Angiosperm and gnetophyte vessels are an example of homoplasy. Is it appropriate to call the liverworts, hornworts, and mosses “lower plants?” Explain why or why not. 5. Name two the defining features of chordates and explain their adaptive significance.
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StudyQuestions_Week7 - Biology 180: Week 7 Study Questions...

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