Speciation and Evolution
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Questions and Answers

What fascinates biologists about speciation?

  • The changes in allele frequencies
  • The number of new species produced (correct)
  • The genetic similarities between species
  • The unity of life

    • How does speciation help explain the unity of life?

  • By increasing the rate of microevolution
  • By producing similar characteristics in species descended from a common ancestor (correct)
  • By creating genetic differences between species
  • By causing species to split into two separate groups

    • What does DNA sequence similarity between species indicate?

  • Different ancestries
  • Unrelated species
  • Closely related species (correct)
  • Species with no common ancestor

    • Which concept emphasizes reproductive isolation as a key aspect of defining species?

    <p>Biological species concept</p> Signup and view all the answers

    How does speciation connect microevolution and macroevolution?

    <p>By forming a bridge between changes in populations and evolution above the species level</p> Signup and view all the answers

    What reveals factors that cause reproductive isolation?

    <p>Hybrid zones</p> Signup and view all the answers

    What keeps the gene pool of a species together, causing its members to resemble each other more than members of other species?

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

    Why are humans and chimpanzees considered distinct biological species?

    <p>Their differences prevent interbreeding successfully.</p> Signup and view all the answers

    What is the main factor that distinguishes the eastern meadowlark (Sturnella magna) from the western meadowlark (Sturnella neglecta) as distinct species?

    <p>Diverse behaviors preventing interbreeding</p> Signup and view all the answers

    What defines humans as a single biological species despite their diverse appearances?

    <p>Capacity to interbreed successfully</p> Signup and view all the answers

    Why is it unlikely for a businesswoman in Manhattan to mate with a dairy farmer in Mongolia?

    <p>Diverse behaviors preventing interbreeding</p> Signup and view all the answers

    What prevents humans and chimpanzees from interbreeding successfully even if they live in the same region?

    <p>'Behavioral differences'</p> Signup and view all the answers

    What does the biological species concept emphasize?

    <p>Reproductive isolation</p> Signup and view all the answers

    According to the biological species concept, what defines a species?

    <p>Potential to interbreed and produce viable, fertile offspring</p> Signup and view all the answers

    Why do biologists compare not only morphology but also physiology, biochemistry, and DNA sequences of organisms?

    <p>To confirm differences in various aspects</p> Signup and view all the answers

    How are members of a biological species united according to the concept?

    <p>By being potentially able to interbreed and produce fertile offspring</p> Signup and view all the answers

    What is the primary definition of species used in the textbook?

    <p>Biological species concept</p> Signup and view all the answers

    Why do morphologically distinct species confirm their classification as discrete groups?

    <p>Because they differ in various ways besides body form</p> Signup and view all the answers

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