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

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

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

Which factor causes reproductive isolation in hybrid zones?

<p>Incomplete reproductive barriers (D)</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 (D)</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 (B)</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 (C)</p> Signup and view all the answers

What does a hybrid zone reveal about reproductive isolation?

<p>The factors that cause reproductive isolation (C)</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 (B)</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 (D)</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 (B)</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 (A)</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 (B)</p> Signup and view all the answers

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

<p>Genetic flow (A)</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 (A)</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 (C)</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 (C)</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 (D)</p> Signup and view all the answers

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