ANT 2301 Exam 1 Review 15-17

ANT 2301 Exam 1 Review 15-17 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Which of the following statements about biological evolution is false? a. Species change over time. b. Natural selection produces changes in species. c. Individuals in a population evolve. d. Different species may share a common ancestor. e. Most populations are genetically diverse. 2. Which of the following descriptions of the gene pool shown below is correct? a. Population size = 15 b. Number of genes = 2 c. Frequency of X1= 0.80 d. Size of gene pool = 30 e. Frequency of X1X3 = 0.10 3. Mistakes in the replication of DNA a. occur often. b. are always repaired. c. provide genetic variation. d. are not transmitted to offspring. e. are always deleterious to an organism. 4. Which of the following phenomena is not an evolutionary mechanism? a. Mutation b. Gene flow c. Genetic drift d. Random mating e. Natural selection 5. Genotype frequencies may be altered by a. genetic drift. b. the founder effect. c. gene flow. d. nonrandom mating. e. All of the above 6. Artificial selection for certain traits in Brassica oleracea (European wild mustard) a. produced a single new species. b. generated new populations with identical genetic makeup. c. gave rise to plants that are quite different in appearance due to the introduction of foreign DNA. d. gave rise to plants that are quite different in appearance by virtue of the genetic variation inherent in the mustard plant. e. gave rise to plants that are quite different in appearance due to low variability in the gene pool of the mustard plant. 7. Which of the following agents of evolution adapts populations to their environments? a. Mutation b. Natural selection c. Nonrandom mating d. Gene flow e. Genetic drift 8. Why does genetic drift affect small populations more than large ones? a. Genetic drift drives the extinction of many species. b. Random changes in allele frequencies from one generation to the next can produce large changes in allele frequencies over time, allowing harmful alleles to increase in frequency. c. Genetic drift in fact affects larger populations more than smaller ones. d. Genetic drift drives the movement of many species worldwide causing populations size to reduce even further. e. Genetic drift affects all populations equally. 9. The frequency of alleles for a given gene locus with two alleles (A and a) in two subpopulations of the same species a. is necessarily the same in both populations. b. can vary from p + q = 1. c. is N = NAA + NAa + Naa (where N is the number of individuals in the populations) in both populations. d. is always lower for the heterozygote. e. is always lower for the homozygotes. 10. The frequency of one allele for a given gene locus with two alleles (A and a) in a population is known. Assume Hardy–Weinberg conditions hold true. Which of the following statements is false? a. The frequency of heterozygotes is given by (p + q)/N, where N is the number of individuals in the population. b. There is sufficient information given to calculate the frequency of heterozygotes (Aa). c. The frequency of a is given by 1 – p. d. The frequency of A is given by 1 – q. e. The frequency of a is dependent on that of A. 11. Allele frequencies measure the of a population, whereas show(s) how it is distributed among its members. a. genetic structure; genotype frequencies b. polymorphisms; genotype frequencies c. genetic variation; genotype frequencies d. genotype frequencies; genetic structure e. genotype frequencies; genetic variation 12. The Hardy–Weinberg equilibrium is not applicable under which of the following conditions? a. Random mating b. Infinite population size c. No gene flow d. Asexual reproduction e. No mutations 13. Which of the following statements about deviations from the Hardy–Weinberg equilibrium in populations is false? a. Deviations are very rare. b. They suggest that mechanisms exist in nature that can change the frequency of alleles. c. They provide evidence for evolution. d. They can help in the identification of the mechanisms of evolution. e. All of the above are true; none is false. 14. Which of the following statements about selection is true? a. Disruptive selection is the only type of selection to produce a bimodal pattern. b. Stabilizing selection increases variation. c. In directional selection, individuals close to the mean have the highest fitness. d. Disruptive selection favors individuals close to the mean. e. Stabilizing selection is the only type of selection that acts on quantitative variation. 15. selection operates if individuals within a population with the smallest and largest body sizes have fewer offspring than those of average body size. a. Stabilizing b. Destabilizing c. Sexual d. Directional e. Disruptive 16. Which of the following statements about synonymous mutations is true? a. They change the amino acid composition of the protein. b. They do not change the phenotype. c. They will affect the structure of the protein. d. They will likely change the activity of the protein. e. They will likely be lethal. 17. Nonsynonymous substitutions in a gene coding for a protein a. result in the replacement of an amino acid in the protein. b. may be neutral. c. may be deleterious. d. may be beneficial. e. All of the above 18. A neutral mutation a. becomes fixed in a large populations more rapidly than in large ones. b. is subject to strong selection. c. confers a selective advantage to an organism. d. is fixed in a population at a rate equal to the mutation rate. e. confers a selective disadvantage to the organism. 19. Comparisons of the genes that code for lysozyme and the amino acid sequence of the enzyme from a number of organisms revealed that a. the rate of nonsynonymous mutations is higher than that of synonymous mutations. b. a common recent ancestor is necessary for organisms to develop very similar adaptations. c. bovine (cattle) lysozyme was exactly the same as langur lysozyme. d. the number of changes in lysozyme uniquely shared by cattle, langur, and the hoatzin was high. e. none of the changes in lysozyme were adaptive. 20. A eukaryotic organism’s genome a. is defined as the genes that code for proteins. b. is all of the DNA in the nucleus. c. is all of the genes in the organism. d. is all of the genes as well as noncoding regions of DNA. e. excludes DNA in organelles. 21. Which of the following statements about the genomes of organisms is false? a. Most of the DNA in a bacterium codes for either RNA or protein. b. The total size of the genome of eukaryotes varies little from organism to organism. c. There is some correlation between genome size and complexity of the organism. d. Pseudogenes may play a role in evolution. e. Noncoding regions of the DNA have higher mutation rates than coding regions. 22. Sexual recombination a. increases the overall reproductive rate. b. can result in the elimination of harmful mutations. c. decreases the variety of genetic combinations. d. changes the frequency of alleles in a population. e. has no influence on evolution. 23. Gene duplication can a. occur by duplication of an entire diploid genome. b. result in the formation of pseudogenes. c. result in genes that are lost from the genome. d. lead to the evolution of genes that code for proteins with new functions. e. All of the above 24. Gene families are groups of genes that arose by and . a. homologous; speciation; sequence evolution b. heterologous; gene duplication; sequence evolution c. homologous; gene duplication; genetic drift d. heterologous; speciation; genetic drift e. homologous; gene duplication; sequence evolution 25. In vitro evolution a. refers to the use of bacteria to study evolution. b. refers to the effects of genes manipulated in vitro on evolution. c. is the synthesis of macromolecules with particular properties based on principles of molecular evolution. d. uses natural selection. e. only works for proteins. 26. The of a phylogenetic tree represents the common ancestor, the represent places where lineages diverge, and the axis represents time. Assume that the tree is oriented as described in the textbook. a. node; roots; horizontal b. root; nodes; horizontal c. root; nodes; vertical d. node; branches; verical e. root; branches; vertical 27. Which of the following phylogenies are equivalent? a. A and B b. A and C c. B and C d. They are all the same. e. They are all different. 28. A is any group of organisms we name, whereas a is any that consists of all the evolutionary descendents of a common ancestor. a. taxon; clade; taxon b. clade; taxon; sister clade c. taxon; sister clade; clade d. taxon; clade; sister clade e. clade; sister clade; taxon 29. All clades are subsets of larger clades. The most inclusive clade on the following diagram is ; the least inclusive clade includes the .