Sexual Selection and Sympatric Speciation
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Questions and Answers

Which process can drive sympatric speciation?

  • Mutation
  • Natural selection
  • Sexual selection (correct)
  • Genetic drift

    • What is a hybrid zone?

  • A region where species compete for resources
  • A region where different species mate and produce hybrids (correct)
  • A region where species evolve in isolation
  • A region where species migrate and interbreed

    • What are hybrids?

  • Species that have complete reproductive barriers
  • Species that are genetically identical
  • Species that can interbreed freely
  • Species that result from mating between species with incomplete reproductive barriers (correct)

    • Where can a hybrid zone occur?

    <p>In a single band where adjacent species meet</p> Signup and view all the answers

    What is the role of sexual selection in cichlid fish speciation?

    <p>It promotes sympatric speciation</p> Signup and view all the answers

    Which factor causes reproductive isolation in hybrid zones?

    <p>Incomplete reproductive barriers</p> Signup and view all the answers

    What is an example of a species that interbreeds in a long and narrow hybrid zone?

    <p>Toads in the genus Bombina</p> Signup and view all the answers

    What is the main focus of Concept 22.3?

    <p>The factors that cause reproductive isolation in hybrid zones</p> Signup and view all the answers

    What does sexual selection for mates of different colors likely contribute to in cichlid fish?

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

    What does a hybrid zone reveal about reproductive isolation?

    <p>The factors that cause reproductive isolation</p> Signup and view all the answers

    Which factor can shift hybrid zones by altering where the habitats of interbreeding species meet?

    <p>Climate change</p> Signup and view all the answers

    What is the possible outcome when closely related species meet in a hybrid zone and there is reinforcement of barriers?

    <p>Reinforcement of barriers</p> Signup and view all the answers

    Which bird species' hybrid zone has shifted northward in North America with climate warming?

    <p>Both black-capped and Carolina chickadees</p> Signup and view all the answers

    What is the possible outcome when closely related species meet in a hybrid zone and there is fusion of species?

    <p>Fusion of species</p> Signup and view all the answers

    What is the possible outcome when closely related species meet in a hybrid zone and there is stability?

    <p>Stability</p> Signup and view all the answers

    What is the process called when genetic flow restarts in a hybrid zone?

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

    What is the process called when reproductive barriers between closely related species are strengthened in a hybrid zone?

    <p>Reinforcement of barriers</p> Signup and view all the answers

    What is the process called when reproductive barriers between closely related species weaken and they merge into a single species in a hybrid zone?

    <p>Genetic fusion</p> Signup and view all the answers

    What is the process called when hybrid individuals continue to be produced without significant changes in the hybrid zone?

    <p>Stability</p> Signup and view all the answers

    What is the possible outcome when closely related species meet in a hybrid zone and there is no significant change in the hybrid zone?

    <p>Stability</p> Signup and view all the answers

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