exam 4 key early section

exam 4 key early section - Evolution BIO 370 Fall 2008...

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Evolution BIO 370 Page 1 Fall 2008: Exam #4, 9:30 AM Section Name: ____ KEY ______________________ Part I: Multiple Choice. [4 points each] Circle the correct letter for each question on this page. 1. Which is most likely to form a fossil? a. a terrestrial worm b. a jelly fish c. a clam d. a short lived lineage of terrestrial lizards e. a and b f. a and c g. all of the above will be equally preserved 2. A phylogeny might be an indispensable tool for studying which of the following cases? a. Studying physiological adaptations in a set of worm species b. Figuring out the temporal sequences of character changes c. Deciding whether a group of plants and their herbivores have coevolved d. b and c e. a and b f. all of the above g. none of the above 3. Which of the following is likely a consequence of the evolution of photosynthesis? a) The earth is now warmer than it would have been without photosynthesis b) The ozone layer is thinner c) The evolution of complex multicellular organisms d) Reduced levels of carbon dioxide in the atmosphere e) Decreased oxidation of exposed metals f) a and c g) c and d h) d and e i) None of the above 4. The fig wasp/nematode coevolutionary relationship a. is an example of antagonistic coevolution b. is a an example of a positive coevolutionary relationship c. has less virulent nematodes when more female wasps enter a fig d. has lower virulence nematodes when vertical transmission predominates e. a, b and c f. only a and d g. a, c, and d h. only c and e i. only b and d 5. Parsimony is a good way to select the best phylogenetic tree when there are conflicts a. if the traits used for reconstruction evolve very quickly b. if all of the traits used are analogies c. only when using molecular characters d. if traits only change infrequently e. only when using morphological characters f. none of the above g. c and e h. a and b
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Evolution BIO 370 Page 2 Fall 2008: Exam #4, 9:30 AM Section Name: ____ KEY ______________________ Part II. Terms . For each term, provide a brief definition that also indicates why the term is important in evolutionary biology . Where appropriate, feel free to provide an example. [4 points for each term] 6. monophyly a phylogenetic group that includes all of the descendants of a common ancestor. [Also known as a clade.] This is the type of group that is reliably and unambiguously reconstructed by synapomorphies. [Also preferable for taxonomic groups to be monophyletic.] 7. character polarization in phylogenetic reconstruction, determining which form of a homologous character is the ancestral condition and which the derived. Important because only the shared derived homologies (synapomorphies) allow for unambiguous grouping of the descendants from a common ancestor [could also have said using shared derived characters create a natural system of classification.] 8. continuous character a phenotypic character (or just character) that varies continuously, i.e., it does not fall into distinct (discrete categories). Important because the methods used to assess whether
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exam 4 key early section - Evolution BIO 370 Fall 2008...

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