352exam2S11 - Biology 352 Exam 2 Ver. A 1. If a locus has...

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Biology 352 Exam 2 Ver. A 1. If a locus has two alleles, A and a, what will be the equilibrium frequency of allele A if both homozygous genotypes have a selection coefficient equal to 1.0? a. 1.0 b. 0.9 c.0.75 d. 0.85 e. 0.50 2. In a population known to be in HWE, 75% of the population displays the dominant trait for the A gene locus. What is the frequency of the recessive allele? a. 1.0 b. 0.9 c.0.75 d. 0.85 e. 0.50 3. Speciation is thought to occur as a result of different populations accumulating enough genetic differences so that they become unable to reproduce with one another. The evolutionary force called ___________ is thought to greatly retard this process. a. gene flow b. genetic drift c. inbreeding d. natural selection e. mutation (Questions 4 & 5) Assume that all Hardy-Weinberg assumptions are originally met in a plant population that is polymorphic at the A locus (alleles A and a). Further assume that this population continues to meet all HWE assumptions except that it now begins to practice regular selfing . 4. Under these conditions, the frequency of allele A would be expected to: a. increase b. decrease c. not change d. change unpredictably e. none of the above 5. Under these conditions, the frequency of heterozygotes would be expected to: b. increase b. decrease c. not change d. change unpredictably e. none of the above 6. Oceanic flight #666 crashes on a remote pacific island with 41 survivors. A total of 16 people have Type O blood (genotype I O I O ), 18 people have Type A blood (genotype I A I O ) and 7 people have type B blood (genotype I B I O ). If the survivors mate at random, what is the probability that the entire island will eventually become fixed for Type O blood through drift? a. 39% b. 50% c. 61% d. 70% e. 100% 7. In a model with one-way migration only, when would we expect to see polymorphism in the destination population at equilibrium? a. Never b. Always c. Always, if the destination has H e > 0 at t = 0 d. Always, if the source has H e > 0 at t = 0 e. Both C and D must be true 8. Wilson disease is an autosomal recessive disorder characterized by a dramatic build-up of intracellular hepatic copper, and subsequent neurological and liver problems. Approximately 30 in 1 million persons have Wilson disease. Assuming random mating, how many people are heterozygous carriers? a. approximately 3 in 100,000 b. approximately 6 in 100,000 c. approximately 5 in 1000 d. approximately 1 in 1000 e. approximately 1 in 100 1
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Biology 352 Exam 2 Ver. A 9. Genetic variation can be studied in natural populations using: a. DNA sequence differences b. differences in the electrophoretic mobility of proteins c. morphological characters only if they have a genetic basis d. A and B only e. A, B and C 10. Expected heterozygosity is: a. the number of heterozygotes seen in a sample from a natural population
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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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352exam2S11 - Biology 352 Exam 2 Ver. A 1. If a locus has...

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