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Unformatted text preview: Chapter 17 Population and Evolutionary Genetics True/False 1. All genetic drift arises from sampling errors and chance. (T) 2. A population may be in Hardy-Weinberg equilibrium for one locus but not for others. (T) 3. Inbreeding results in an increase in the frequency of heterozygotes compared to the results of random mating. (F) 4. Genetic variation must exist within a population before evolution can take place. (T) 5. Genetic differences in large, randomly breeding populations remain constant if migration occurs. (F) 6. Evolution cannot be directly observed. (F) 7. Evolution occurs in individuals, as well as in groups. ( F ) 8. Sympatric speciation is the most common source of the origin of species. ( F ) 9. For most protein-encoding genes, the synonymous rate of change is considerably higher than the nonsynonymous rate. ( T ) 10. Different parts of genes evolve at different rates. (T) Multiple Choice 11-12. Rapid changes in allelic frequencies by e take place in populations that are d . a. mutation b. evolving c. migrating *d. small *e. genetic drift 13-14. Migration tends to c genetic variation between subpopulations and a genetic variation within each subpopulation. *a. increase. b. not change. Chapter 17 *c. reduce. d. standardize. e. invert. 15. Which of the following evolutionary forces does NOT change allele frequencies? *a. nonrandom mating b. mutation c. selection d. drift e. migration 16. Which agent of evolution would tend to increase the frequency of all recessive phenotypes in a population relative to what is expected from Hardy- Weinberg equilibrium? a. Genetic drift *b. Inbreeding c. Natural selection d. Positive assortative mating e. Negative assortative mating 17. DNA typing is used to compare evidence DNA (E) left at a crime scene to two suspects (S1 and S2). Suspect 1 is excluded by the evidence, but suspect 2 remains included. What is the expected frequency of suspect 2s genotype if the allele frequencies in the population are f(A 1 ) = 0.1, f(A 2 ) = 0.2, and f(A 3 ) = 0.7 and the population is at Hardy-Weinberg equilibrium? a. 0.01 *b. 0.04 c. 0.14 d. 0.28 e. 0.49 18. Five male and 5 female astronauts set off on a voyage that after several hundred years will establish a new colony of humans in another galaxy. What will likely be true of the colony that is established? a. The genetic structure of the colony will be about the same as that of the population of humans on Earth. b. The colony will contain the same amount of genetic diversity as is found among humans on Earth. c. The colony will contain more genetic diversity than is found among humans on Earth. *d. The colony will contain much less genetic diversity than is found among humans on Earth....
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