The Smallest Unit of Evolution
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Questions and Answers

Which of the following is a common misconception about evolution?

  • Individual organisms evolve (correct)
  • Genetic variation is necessary for evolution
  • Only populations can evolve
  • Natural selection acts on populations

    • What is microevolution?

  • A change in heritable traits in individual organisms
  • A change in genetic drift in a population
  • A change in gene flow between populations
  • A change in allele frequencies in a population over generations (correct)

    • Which of the following mechanisms can cause allele frequency change in a population?

  • Genetic drift and gene flow
  • Natural selection and genetic drift (correct)
  • Natural selection and gene flow
  • Genetic drift and internal isolation

    • What is the main mechanism that consistently causes adaptive evolution?

    <p>Natural selection (D)</p> Signup and view all the answers

    What is a prerequisite for evolution by natural selection?

    <p>Genetic variation (D)</p> Signup and view all the answers

    What does natural selection act on?

    <p>Individuals (B)</p> Signup and view all the answers

    What is the smallest unit of evolution?

    <p>Populations (D)</p> Signup and view all the answers

    Which of the following is not a mechanism that causes allele frequency change?

    <p>Internal isolation (B)</p> Signup and view all the answers

    What is the evidence of selection by food source shown in Figure 21.2?

    <p>Finch evolving (C)</p> Signup and view all the answers

    What does microevolution refer to?

    <p>Change in allele frequencies in a population (D)</p> Signup and view all the answers

    According to Mendel's work on pea plants, what did it provide evidence of?

    <p>Discrete heritable units (A)</p> Signup and view all the answers

    What does genetic variation refer to?

    <p>Differences in the composition of genes and other DNA sequences among individuals (D)</p> Signup and view all the answers

    How are some phenotypic differences classified?

    <p>On an either-or basis (B)</p> Signup and view all the answers

    What determines traits that are usually 'either-or' in nature?

    <p>A single gene (B)</p> Signup and view all the answers

    What influences coat color in horses?

    <p>Multiple genes (A)</p> Signup and view all the answers

    What can genetic variation be measured at?

    <p>The molecular level of DNA (A)</p> Signup and view all the answers

    Where do most nucleotide variations occur?

    <p>In noncoding regions (introns) (A)</p> Signup and view all the answers

    Do nucleotide variations in coding regions usually affect protein sequences?

    <p>No, but they can affect protein function (A)</p> Signup and view all the answers

    What kind of genetic variation is shown in Figure 21.4?

    <p>Genetic variation at the molecular level (B)</p> Signup and view all the answers

    Which of the following is true about genetic variation?

    <p>It can occur in both coding and noncoding regions of DNA (D)</p> Signup and view all the answers

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