pq4 - Biology 352 Practice Quiz #4 1. Local populations of...

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1. Local populations of marine bivalves (clams) are connected by migrating larvae. Eggs hatch into larvae that can be swept by the oceanic currents anywhere within southern California. Then the larvae settle to the bottom and grow into clams, which do not move. For genes not subject to natural selection, it is best to model evolution in this group of clam populations using a. the one-way model of migration. b. the island model of migration. c. the Hardy Weinberg equilibrium model. d. the overdominance model. e. the two-way mutation model. 2. Which of the following is true about underdominance? a. Underdominance usually leads to H e > 0 for the gene under selection. b. If we start with almost any value of p and q, the allele frequencies will remain constant over time. c. Underdominance is the most important form of natural selection for maintaining genetic variation. d. At equilibrium, underdominance usually leads to H o = 0 for the gene under selection. e. All of the above are true. 3. In a population of 200 randomly mating polar bears, a brand new mutation appears in the gene pool during a particular generation. If there are no more mutations, and drift is the only microevolutionary force, what is the most likely outcome? a. Eventually, that new mutation will be lost. b. Eventually, that new mutation will take over the whole gene pool. c. Eventually, that new mutation will stabilize at a frequency of 0.5 d. Eventually, that new mutation will stabilize at a frequency of 0.005 e. Eventually, that new mutation will stabilize at a frequency of 0.0025 4. The allele B undergoes mutation to b at a rate of 1 x 10-6 per generation. If the frequency of B is now 0.5, what will it be in 100 generations? (Assume that mutation from B to b is the only microevolutionary process). a. 0.49990 b. 0.49995 c. 0.49999 d. 0.50000 e. 0.50010 5. In an population of birds, sexual selection occurs for bright colors in males according to the following rules: AA males are bright blue and have 4 offspring on average. Aa individuals are dull blue and
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This note was uploaded on 05/07/2011 for the course BIOLOGY 352 taught by Professor Townsend during the Spring '08 term at San Diego State.

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pq4 - Biology 352 Practice Quiz #4 1. Local populations of...

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