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Questions and Answers
What is the primary focus of the morphospecies concept?
What is the primary focus of the morphospecies concept?
- Genetic differences
- Ecological interactions
- Morphological differences (correct)
- Reproductive isolation
Which of the following is a weakness of the morphospecies concept?
Which of the following is a weakness of the morphospecies concept?
- It overlooks ecological interactions
- It fails to consider reproductive isolation
- It has limited applicability in fossil species
- It does not account for genetic differences (correct)
How does the biological species concept define a species?
How does the biological species concept define a species?
- As a group of morphologically similar organisms
- As a group of interbreeding populations (correct)
- Based on ecological niche
- Based on geographic isolation
Which of the following is an example of postzygotic isolating mechanism?
Which of the following is an example of postzygotic isolating mechanism?
Why is reduced hybrid viability considered a postzygotic isolating mechanism?
Why is reduced hybrid viability considered a postzygotic isolating mechanism?
Which of the following is an example of hybrid sterility as a postzygotic isolating mechanism?
Which of the following is an example of hybrid sterility as a postzygotic isolating mechanism?
What is the primary condition that favors sympatric speciation?
What is the primary condition that favors sympatric speciation?
Which group of organisms commonly speciates by sympatric speciation?
Which group of organisms commonly speciates by sympatric speciation?
Why is sympatric speciation a challenging concept to understand?
Why is sympatric speciation a challenging concept to understand?
Which concept defines a species based on observable physical traits?
Which concept defines a species based on observable physical traits?
What is a potential weakness of the morphospecies concept?
What is a potential weakness of the morphospecies concept?
Why is hybridization a challenge to the Biological Species Concept (BSC)?
Why is hybridization a challenge to the Biological Species Concept (BSC)?
What is the biological species concept mainly based on?
What is the biological species concept mainly based on?
What is a major weakness of the biological species concept?
What is a major weakness of the biological species concept?
How does the biological species concept define a species?
How does the biological species concept define a species?
What is a postzygotic isolating mechanism?
What is a postzygotic isolating mechanism?
Which of the following is an example of postzygotic isolating mechanism?
Which of the following is an example of postzygotic isolating mechanism?
Why does hybrid inviability pose a challenge to species reproductive success?
Why does hybrid inviability pose a challenge to species reproductive success?
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Study Notes
Species Concepts
- The primary focus of the morphospecies concept is on observable physical traits.
- A weakness of the morphospecies concept is that it may not accurately reflect the genetic differences between species.
Biological Species Concept
- The biological species concept defines a species as a group of interbreeding individuals that are reproductively isolated from other groups.
- The biological species concept is mainly based on reproductive isolation.
Postzygotic Isolating Mechanisms
- A postzygotic isolating mechanism is a reproductive barrier that occurs after the formation of a zygote.
- Examples of postzygotic isolating mechanisms include reduced hybrid viability and hybrid sterility.
- Reduced hybrid viability is considered a postzygotic isolating mechanism because it reduces the chances of hybrid offspring surviving to reproduce.
- Hybrid sterility is an example of a postzygotic isolating mechanism where hybrid offspring are unable to reproduce.
- Hybrid inviability poses a challenge to species reproductive success because it reduces the chances of hybrid offspring surviving to reproduce.
Sympatric Speciation
- Sympatric speciation occurs when a new species emerges from a single population without geographic isolation.
- A primary condition that favors sympatric speciation is the presence of a distinct ecological niche.
- Some groups of organisms, such as insects, commonly speciate by sympatric speciation.
- Sympatric speciation can be a challenging concept to understand because it involves the emergence of a new species within a single population.
Biological Species Concept Weaknesses
- A major weakness of the biological species concept is that it can be challenging to apply in practice, especially in cases where hybridization occurs.
- Hybridization is a challenge to the Biological Species Concept (BSC) because it can blur the boundaries between species.
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