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According to the biological species concept, a species is defined as a group of naturally occurring populations that...
According to the biological species concept, a species is defined as a group of naturally occurring populations that...
- only actually interbreed and are reproductively isolated from other such groups
- either actually or potentially interbreed and are reproductively isolated from other such groups (correct)
- neither actually nor potentially interbreed but are reproductively isolated from other such groups
- only potentially interbreed and are reproductively isolated from other such groups
The focus of the biological species concept is on...
The focus of the biological species concept is on...
- geographical distribution
- population size
- genetic diversity
- reproductive isolation (correct)
One of the problems with the biological species concept is that it doesn't apply to...
One of the problems with the biological species concept is that it doesn't apply to...
- large populations
- geographically isolated populations
- asexual organisms (correct)
- populations with high genetic diversity
The biological species concept is not applicable to asexual organisms because...
The biological species concept is not applicable to asexual organisms because...
In the biological species concept, if two populations are not reproductively isolated from each other, then...
In the biological species concept, if two populations are not reproductively isolated from each other, then...
One of the problems with the biological species concept in relation to fossils is that...
One of the problems with the biological species concept in relation to fossils is that...
What is the Red Queen hypothesis?
What is the Red Queen hypothesis?
What is exaptation?
What is exaptation?
What is heterochrony?
What is heterochrony?
Which best describes neoteny?
Which best describes neoteny?
What is an example of exaptation?
What is an example of exaptation?
What best describes the Red Queen hypothesis?
What best describes the Red Queen hypothesis?
What is punctuated speciation?
What is punctuated speciation?
What would not lead to punctuated speciation?
What would not lead to punctuated speciation?
What is the best definition of heterochrony?
What is the best definition of heterochrony?
What is the definition of evolution?
What is the definition of evolution?
Which mechanism can lead to the reinforcement of prezygotic isolating mechanisms?
Which mechanism can lead to the reinforcement of prezygotic isolating mechanisms?
What are the 2 theories of the debated tempo of speciation?
What are the 2 theories of the debated tempo of speciation?
What follows mass extinction events, leading to rapid evolution of diverse phenotypes under new environmental conditions?
What follows mass extinction events, leading to rapid evolution of diverse phenotypes under new environmental conditions?
What is the rate at which extinction is occurring compared to average historical rates?
What is the rate at which extinction is occurring compared to average historical rates?
What is the definition of microevolution?
What is the definition of microevolution?
Which event can drive rapid speciation?
Which event can drive rapid speciation?
Which species concept relies on DNA data to determine species membership?
Which species concept relies on DNA data to determine species membership?
What is a crucial factor in all species concepts and plays a major role in speciation?
What is a crucial factor in all species concepts and plays a major role in speciation?
Which type of speciation occurs without physical or geographical separation?
Which type of speciation occurs without physical or geographical separation?
Which isolating mechanisms act after zygote formation?
Which isolating mechanisms act after zygote formation?
What does natural selection favor to ensure viable offspring capable of passing on genes?
What does natural selection favor to ensure viable offspring capable of passing on genes?
What does the morphological species concept focus on for bird identification?
What does the morphological species concept focus on for bird identification?
Which species concept relies on DNA data to determine species membership?
Which species concept relies on DNA data to determine species membership?
What is a crucial factor in all species concepts and plays a major role in speciation?
What is a crucial factor in all species concepts and plays a major role in speciation?
Which type of speciation occurs due to physical or geographical separation?
Which type of speciation occurs due to physical or geographical separation?
What prevents zygote formation as a prezygotic isolating mechanism?
What prevents zygote formation as a prezygotic isolating mechanism?
Which isolating mechanism acts after zygote formation?
Which isolating mechanism acts after zygote formation?
What does natural selection favor to ensure viable offspring capable of passing on genes?
What does natural selection favor to ensure viable offspring capable of passing on genes?
Which concept is not applicable to organisms producing hybrids in captivity or existing only in the fossil record?
Which concept is not applicable to organisms producing hybrids in captivity or existing only in the fossil record?
Organisms have to evolve to get better adapted to their environments according to the Red Queen hypothesis
Organisms have to evolve to get better adapted to their environments according to the Red Queen hypothesis
Exaptation occurs when a structure evolved for one purpose is never used for another
Exaptation occurs when a structure evolved for one purpose is never used for another
Heterochrony can give rise to speciation
Heterochrony can give rise to speciation
Neoteny is when adults have retained juvenile traits
Neoteny is when adults have retained juvenile traits
Increased rates of neutral mutations would lead to rapid speciation
Increased rates of neutral mutations would lead to rapid speciation
The swim bladders of fish evolving from the lungs of lungfish is an example of exaptation
The swim bladders of fish evolving from the lungs of lungfish is an example of exaptation
The Permian mass extinction event is considered the largest extinction event in the history of the world
The Permian mass extinction event is considered the largest extinction event in the history of the world
Higher rates of extinction are expected in organisms with longer generation times
Higher rates of extinction are expected in organisms with longer generation times
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Study Notes
Species Concepts and Speciation
- The biological species concept is not quantifiable, leading to the exploration of alternative species concepts.
- The morphological species concept defines species based on physical appearance and is considered the simplest definition of a species.
- The lineage species concept relies on DNA data to determine species membership, with 99.9% DNA similarity often indicating the same species.
- Reproductive isolation is a crucial factor in all species concepts and plays a major role in speciation, allowing separate evolution.
- Two major types of speciation are allopatric, occurring due to physical or geographical separation, and sympatric, occurring without such barriers.
- Prezygotic isolating mechanisms prevent zygote formation, including habitat, temporal, behavioral, mechanical, and gametic isolation.
- Postzygotic isolating mechanisms act after zygote formation, such as reduced hybrid viability and fertility.
- Natural selection favors prezygotic barriers over postzygotic barriers to ensure viable offspring capable of passing on genes.
- The biological species concept is not applicable to organisms producing hybrids in captivity or existing only in the fossil record.
- Field guides for bird identification are based on the morphological species concept, focusing on physical forms of organisms.
- The biological species concept cannot group fossils or asexual organisms into species.
- Habitat isolation, as seen in black bears and brown bears, prevents interbreeding by keeping species in different habitats and niches.
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