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Chemistry LibreTexts

13.05 Week 13 Quiz

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    cc_profilecc.multiple_choice.v0p1The more genetic variation a population has, the more likely it is that some individuals willevolve.migrate.survive.mutate.3100cc_profilecc.multiple_choice.v0p1Genetic variation can arise from a random change in the DNA of a gene. This change is called a(n)mutation.gene flow.gene pool.allele.5100cc_profilecc.multiple_choice.v0p1Which term means the crossing of two different species that share common genes?mutationhybridizationpopulationrecombination10100cc_profilecc.multiple_choice.v0p1Natural selection that changes the distribution of a trait to favor one extreme phenotype is calleddisruptive selection.stabilizing selection.normalizing selection.directional selection.16100cc_profilecc.multiple_choice.v0p1In stabilizing selection, what occurs in a population?The population shifts toward one of two extreme phenotypes.Both extreme phenotypes shift toward the middle.The intermediate phenotype becomes more common.The intermediate phenotype becomes rare.19100cc_profilecc.multiple_choice.v0p1A population that is not undergoing natural selection displays what type of distribution?normaldisruptivedirectionalstabilizing21100cc_profilecc.multiple_choice.v0p1In a population of birds, intermediate beak size is selected against, and both very small and very large beak sizes are favored. What type of selection is this an example of?directionaldisruptivenormalstabilizing26100cc_profilecc.multiple_choice.v0p1Chance changes in allele frequencies within a population are calledgene flow.gene pool.genetic drift.sexual selection.31100cc_profilecc.multiple_choice.v0p1A small number of birds, blown off course during migration, find an island and colonize it. This population will most likely experience genetic drift as a result of thefounder effect.bottleneck effect.sexual selection.mutations.33100cc_profilecc.multiple_choice.v0p1What increases genetic variation when animals move from one population to another population?genetic driftsexual selectionbottleneck effectgene flow40100cc_profilecc.multiple_choice.v0p1A problem in all populations influenced by the bottleneck effect is thatgenetic variation is lost.alleles can't become fixed.offspring inherit harmful alleles.chance no longer affects them.41100cc_profilecc.multiple_choice.v0p1Which of the following conditions could mean that a population is in Hardy-Weinberg equilibrium?The population is small.Gene flow is common.Mating is random.Mutations occur frequently.47100cc_profilecc.multiple_choice.v0p1The five factors that can lead to evolution are gene flow, genetic drift, mutation, natural selection, andsexual selection.controlled mating.emigration.immigration.49100cc_profilecc.multiple_choice.v0p1Which of the following statements applies to real populations?Mutations are rarely passed to offspring.Hardy-Weinberg equilibrium is rare.Gene flow represses alleles for desirable traits.Evolution cannot occur in large populations.54100cc_profilecc.multiple_choice.v0p1What is speciation?combining of two species to form one with different traitsisolation that affects mating behaviortiming of mating that prevents normal sexual selectiondivergence of two or more species from an existing one60100cc_profilecc.multiple_choice.v0p1An earthquake causes an ocean channel to open up on an island where a low area previously existed. The island's lizard population is now separated on the two parts of the island, providing an example ofgeographic isolation.behavioral isolation.disruptive selection.temporal isolation.61100cc_profilecc.multiple_choice.v0p1Which of the following examples illustrates a temporal barrier to mating between populations?Populations of the same species of seal live on islands too far apart to swim between them for mating.Species of birds have elaborate courtship dances, and females select the best dancers as mates.Varieties of oak tree produce pollen during different seasons, so they can't pollinate one another.Herds of caribou misinterpret each other's mating behavior, so they fight instead of mating.67100cc_profilecc.multiple_choice.v0p1What kind of isolation occurs when two populations of birds have different courtship dances?geographicsexualtemporalbehavioral72100cc_profilecc.multiple_choice.v0p1The Galápagos Islands in the Pacific Ocean have varied habitats. Divergent evolution is occurring on these islands, meaning that the species that live therehave lived unchanged through long periods of stability.are becoming more like each other in response to their habitats.change in response to changes in other species they interact with.had common ancestors but have become increasingly different.76100cc_profilecc.multiple_choice.v0p1The total and permanent disappearance of a species from Earth is calledradiation.coevolution.extinction.equilibrium.79100cc_profilecc.essay.v0p1qmd_computerscoredNo<p>Ellis-van Creveld syndrome is a recessive trait. Explain why it has become common in the Amish of Lancaster County, Pennsylavia, while remaining very rare in other human populations.</p>100cc_profilecc.essay.v0p1qmd_computerscoredNo<p>Why is phenotpic variation necessary for natural selection and sexual selection?</p>100