The Smallest Unit of Evolution
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Questions and Answers

Which of the following is a common misconception about evolution?

  • Individual organisms can evolve (correct)
  • Natural selection acts on populations
  • Only populations can evolve
  • Genetic drift causes adaptive evolution

    • What is microevolution?

  • The flow of genes between populations
  • The isolation of a population from others
  • The process of genetic drift
  • A change in allele frequencies in a population over generations (correct)

    • Which of the following is NOT one of the main mechanisms that cause allele frequency change?

  • Genetic drift
  • Mutation (correct)
  • Gene flow
  • Natural selection

    • Which mechanism 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>Variation in heritable traits (B)</p> Signup and view all the answers

    What is the smallest unit of evolution, according to the text?

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

    What is the main factor that causes allele frequency change due to random events?

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

    What is the term used to describe the flow of genes between populations?

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

    What is the main mechanism of evolution that acts on individuals?

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

    Which figure in the text provides evidence of selection by food source?

    <p>Figure 21.2 (B)</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 (D)</p> Signup and view all the answers

    What does genetic variation reflect?

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

    What is genetic variation?

    <p>Differences in gene composition among individuals (C)</p> Signup and view all the answers

    How are some phenotypic differences classified?

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

    What determines traits that can be classified on an 'either-or' basis?

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

    What causes other phenotypic differences that vary along a continuum?

    <p>Influence of many genes (C)</p> Signup and view all the answers

    How can genetic variation be measured at the molecular level?

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

    Where do most nucleotide variations occur?

    <p>Noncoding regions (introns) (C)</p> Signup and view all the answers

    Do variations in coding regions (exons) affect the protein's sequence of amino acids?

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

    What does Figure 21.4 show about genetic variation at the molecular level?

    <p>Extensive genetic variation (B)</p> Signup and view all the answers

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