Podcast
Questions and Answers
Which of the following is a limitation of the biological species concept?
Which of the following is a limitation of the biological species concept?
- It emphasizes gene flow between distinct species
- It cannot be applied to fossils or asexual organisms (correct)
- It is a widely accepted concept in biology
- It can only be applied to mammals
What does the biological species concept emphasize?
What does the biological species concept emphasize?
- Physical characteristics
- Mutation rates
- Presence of gene flow
- Absence of gene flow (correct)
Which of the following is an example of gene flow between distinct species?
Which of the following is an example of gene flow between distinct species?
- Birds and fish mating to produce 'birdfish'
- Humans and plants mating to produce 'humaplants'
- Dogs and cats mating to produce 'dot'
- Grizzly bears and polar bears mating to produce 'grolar bears' (correct)
Why can't the biological species concept be applied to fossils?
Why can't the biological species concept be applied to fossils?
What is one limitation of the biological species concept?
What is one limitation of the biological species concept?
Which two species of bears can mate to produce 'grolar bears'?
Which two species of bears can mate to produce 'grolar bears'?
What is the main focus of the biological species concept?
What is the main focus of the biological species concept?
Which of the following is a reason why gene flow between distinct species can occur?
Which of the following is a reason why gene flow between distinct species can occur?
What is an example of hybridization between two species of bears?
What is an example of hybridization between two species of bears?
What does the biological species concept cannot be applied to?
What does the biological species concept cannot be applied to?
Which species concept defines a species by structural features and does not rely on information about gene flow?
Which species concept defines a species by structural features and does not rely on information about gene flow?
What is a disadvantage of the morphological species concept?
What is a disadvantage of the morphological species concept?
Which species concept defines a species in terms of its ecological niche and emphasizes the role of disruptive selection?
Which species concept defines a species in terms of its ecological niche and emphasizes the role of disruptive selection?
What is a disadvantage of the ecological species concept?
What is a disadvantage of the ecological species concept?
What is the process of speciation that occurs when populations are geographically isolated from each other?
What is the process of speciation that occurs when populations are geographically isolated from each other?
What is the process of speciation that occurs when populations are not geographically isolated?
What is the process of speciation that occurs when populations are not geographically isolated?
In allopatric speciation, gene flow is interrupted when a population is divided into geographically isolated __________.
In allopatric speciation, gene flow is interrupted when a population is divided into geographically isolated __________.
What can cause separated gene pools to diverge in allopatric speciation?
What can cause separated gene pools to diverge in allopatric speciation?
What may arise as a by-product of genetic divergence in allopatric speciation?
What may arise as a by-product of genetic divergence in allopatric speciation?
What is an example of behavioral isolation evolving in allopatric speciation?
What is an example of behavioral isolation evolving in allopatric speciation?
Study Notes
Biological Species Concept
- Emphasizes reproductive isolation between species
- Unable to be applied to fossils, as it requires observations of reproductive behaviors
- Limited in that it cannot be applied to species that are extinct or have no living members
Gene Flow and Hybridization
- Gene flow between distinct species can occur when there is a lack of reproductive barriers
- Example of hybridization: grizzly bears (Ursus arctos) and polar bears (Ursus maritimus) can mate to produce 'grolar bears'
Species Concepts
- Morphological species concept: defines a species by structural features and does not rely on information about gene flow
- Disadvantage: may not accurately reflect evolutionary relationships
- Ecological species concept: defines a species in terms of its ecological niche and emphasizes the role of disruptive selection
- Disadvantage: may not be able to distinguish between closely related species
Speciation
- Allopatric speciation: occurs when populations are geographically isolated from each other
- Process of speciation that occurs when a population is divided into geographically isolated groups, resulting in interrupted gene flow
- Divergence of separated gene pools can be caused by genetic drift, mutation, and natural selection
- May result in the formation of new species
- Behavioral isolation can evolve as a by-product of genetic divergence in allopatric speciation
Other Key Points
- Sympatric speciation: occurs when populations are not geographically isolated from each other
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Description
Test your knowledge on the limitations of the Biological Species Concept with this quiz. Explore why this concept cannot be applied to fossils or asexual organisms, and discover the instances where gene flow occurs between distinct species. Challenge yourself and expand your understanding of the boundaries of the Biological Species Concept.
