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studyquestions exam2 2010

studyquestions exam2 2010 - L567(2010 study questions for...

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L567 (2010): study questions for second exam. Final set, updated 26 Nov 2010. 1. Briefly describe Stanley’s hypotheses for the preponderance of cross-fertilizing plants and animals. Compare his idea with Nunney’s idea. Why are these ideas considered “macroevolutionary”? 2. Contrast hard selection, soft selection, frequency-dependent selection, and density- dependent selection. How are they related to ideas concerning the maintenance of genetic polymorphism? Which one of these ideas are related to the tangled bank hypothesis and to “multiple-niche polymorphism” theory, and why? 3. Discuss the paper on the evolution of recombination rates by Burt and Bell (1987). Why do longer-lived species have more recombination? Why do domesticated species have relatively high rates of recombination? 4. What is the cost of sex? Contrast the primary ecological theories for the maintenance of cross-fertilization in the face of this cost. 8. How is the Red Queen model conceptually related to the Rock Paper Scissors game? How could host-parasite coevolution select for recombination. 9. What is linkage disequilibrium (give a verbal and mathematical description)? 10. In general, what is the effect of recombination on linkage disequilibrium? Under what conditions would increased rates of recombination be favored by natural selection?
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