20 Questions
Which process can drive sympatric speciation?
Sexual selection
What is a hybrid zone?
A region where different species mate and produce hybrids
What are hybrids?
Species that result from mating between species with incomplete reproductive barriers
Where can a hybrid zone occur?
In a single band where adjacent species meet
What is the role of sexual selection in cichlid fish speciation?
It promotes sympatric speciation
Which factor causes reproductive isolation in hybrid zones?
Incomplete reproductive barriers
What is an example of a species that interbreeds in a long and narrow hybrid zone?
Toads in the genus Bombina
What is the main focus of Concept 22.3?
The factors that cause reproductive isolation in hybrid zones
What does sexual selection for mates of different colors likely contribute to in cichlid fish?
Reproductive isolation
What does a hybrid zone reveal about reproductive isolation?
The factors that cause reproductive isolation
Which factor can shift hybrid zones by altering where the habitats of interbreeding species meet?
Climate change
What is the possible outcome when closely related species meet in a hybrid zone and there is reinforcement of barriers?
Reinforcement of barriers
Which bird species' hybrid zone has shifted northward in North America with climate warming?
Both black-capped and Carolina chickadees
What is the possible outcome when closely related species meet in a hybrid zone and there is fusion of species?
Fusion of species
What is the possible outcome when closely related species meet in a hybrid zone and there is stability?
Stability
What is the process called when genetic flow restarts in a hybrid zone?
Genetic flow
What is the process called when reproductive barriers between closely related species are strengthened in a hybrid zone?
Reinforcement of barriers
What is the process called when reproductive barriers between closely related species weaken and they merge into a single species in a hybrid zone?
Genetic fusion
What is the process called when hybrid individuals continue to be produced without significant changes in the hybrid zone?
Stability
What is the possible outcome when closely related species meet in a hybrid zone and there is no significant change in the hybrid zone?
Stability
Test your knowledge on sexual selection and its role in sympatric speciation. Explore the example of cichlid fish in Lake Victoria and how sexual selection for different colors may have contributed to their speciation.
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