Homology is evidence of ______.

1 of 20Homology is evidence of ______.A. directional selectionB. convergent evolutionC. genetic driftD. common ancestry2 of 20Which one of the following statements is true?A. Natural selection works on non-heritable traits.B. Natural selection works on variation already present in a population.C. Individuals evolve through natural selection.D. Organisms evolve structures that they need.3 of 20Natural selection results in ______.A. increased genetic variationB. offspring better adapted to a future environmentC. a decrease in the size of a populationD. offspring adapted to their current environment4 of 20Who believed in species change by passing acquired characteristics on to offspring?A. WallaceB. MendelC. LamarckD. Darwin5 of 20Which one of the following will prevent significant genetic drift?A. Gene flow is absent.B. The population size is large.C. There is genetic variation.D. Variation in a particular trait is heritable.6 of 20Which of these types of Galapagos species most influenced Darwin to develop the theory of species change by natural selection?A. GoatsB. ReptilesC. Small birdsD. Cacti7 of 20All of the alleles of all of the genes within a population make up that population’s ______.A. genotypeB. heterozygosityC. gene poolD. gene flow8 of 20A small population of deer is introduced to an island. All the males have 11-13 points on their antlers. After several generations, if all males have 12 point antlers, this is due toA. disruptive selection.B. stabilizing selection.C. directional selection.D. bottleneck effect.9 of 20Two nearby populations, in which there is some movement of individuals between the populations, are an example ofA. gene flow.B. disruptive selection.C. genetic drift.D. bottleneck effect.10 of 20Evidence which supports the theory of evolution is found in studies ofA. embryos.B. biochemistry.C. fossils.D. All of the above.11 of 20Which of the following is an example of sexual selection?A. Peahens choose to mate with peacocks that have the most beautiful tails.B. Bacteria evolve resistance to antibiotics.C. Sexual recombination occurs during meiosis.D. Cheetahs experienced a population bottleneck.12 of 20The publication date of Darwin’s The Origin of Species wasA. 1809.B. 1830.C. 1869.D. 1859.13 of 20Imagine a population of tree frogs in South America whose habitat has been reduced to the point where only 25 frogs survive. This is an example ofA. founder effect.B. bottleneck effect.C. genetic drift.D. All of the above.14 of 20Homologous structures, such as a bat wing and whale flipperA. are similar externally but have different basic structures and were probably not derived from a common ancestor.B. are the result of pairs of chromosomes that are identical in bats and whales.C. have the same underlying structure due to inheritance from a common ancestor.D. are structures that did not develop in response to natural selection.15 of 20Which of the following is an example of directional selection?A. The birth weight at which newborn humans are most likely to survive and the average weight of newborn humans are about the same.B. There is an increase in antibiotic-resistant strains of bacteria.C. Garter snakes with different coloration patterns behave differently when threatened.D. A catastrophe wipes out nearly 99% of a population.16 of 20A small population of deer is introduced to an island. All the males have 11-13 points on their antlers. After several generations, if most males have antlers with 20 points, this is the result ofA. the founder effect.B. stabilizing selection.C. disruptive selection.D. directional selection.17 of 20Darwin and Lamarck both realized that most species produce many more offspring than is necessary to maintain a constant population. What is the fate of the excess individuals?A. Evolution kills them off.B. They evolve to take advantage of natural resources.C. The more favorable forms survive and reproduce, while the others do not.D. They mutate and then are able to adapt to new environments.18 of 20Genetic drift results in a change in gene frequencies becauseA. the population size is so small that chance occurrences can alter gene frequencies.B. reproduction is non-random within the population.C. the population has not yet stabilized.D. the population is so large that natural selection has little noticeable effect.19 of 20Which of the following males in a given population would be considered the most fit in an evolutionary sense? One that producedA. 1,000 offspring, of which 100 survived but 99 did not reproduce.B. two offspring, both of which survived and produced offspring of their own.C. 10 offspring, of which 10 survived, but nine did not reproduce.D. 100 offspring of which 10 survived but nine did not reproduce.20 of 20While on the Beagle, Darwin was influenced by a book by Charles Lyell that suggested that Earth was ______ and sculpted by geologic processes that ______ .A. old; continueB. old; no longer occurC. young; continueD. young; no longer occur

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