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The cohesion species concept is based on the idea that species are maintained by a system of mechanisms that maintain genetic coherence and limit evolutionary change.
The cohesion species concept is based on the idea that species are maintained by a system of mechanisms that maintain genetic coherence and limit evolutionary change.
True (A)
The phylogenetic species concept defines a species as a group of organisms that are very genetically similar without respect to ancestry.
The phylogenetic species concept defines a species as a group of organisms that are very genetically similar without respect to ancestry.
False (B)
The recognition species concept and the cohesion species concept have fewer limitations than the biological species concept.
The recognition species concept and the cohesion species concept have fewer limitations than the biological species concept.
False (B)
According to the cohesion species concept, a species is defined by its potential for cohesion via mechanisms, like mating systems and developmental systems, resulting in the sharing of traits.
According to the cohesion species concept, a species is defined by its potential for cohesion via mechanisms, like mating systems and developmental systems, resulting in the sharing of traits.
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The phylogenetic species concept focuses on the potential for phenotypic cohesion among individuals within a species.
The phylogenetic species concept focuses on the potential for phenotypic cohesion among individuals within a species.
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The biological species concept uses primarily physical appearance to define a species.
The biological species concept uses primarily physical appearance to define a species.
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Morphospecies are identified through the morphological species concept.
Morphospecies are identified through the morphological species concept.
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The term 'species concept' refers to the singular, universally accepted definition of a species.
The term 'species concept' refers to the singular, universally accepted definition of a species.
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Sexual dimorphism is demonstrated when male and female individuals exhibit different morphological form but still belong to the same species.
Sexual dimorphism is demonstrated when male and female individuals exhibit different morphological form but still belong to the same species.
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Sibling species are morphologically similar but can interbreed.
Sibling species are morphologically similar but can interbreed.
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The morphological species concept is also referred to as the ecological species concept.
The morphological species concept is also referred to as the ecological species concept.
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Polymorphism refers to a species having multiple distinct morphological form.
Polymorphism refers to a species having multiple distinct morphological form.
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According to the described content there are 7 major species concepts.
According to the described content there are 7 major species concepts.
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The biological species concept primarily relies on geographic isolation and environmental factors to define species.
The biological species concept primarily relies on geographic isolation and environmental factors to define species.
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According to the biological species concept, a liger, resulting from a cross between a lion and a tiger, is considered a distinct species.
According to the biological species concept, a liger, resulting from a cross between a lion and a tiger, is considered a distinct species.
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The evolutionary species concept is a mechanistic approach that allows direct observation of the birth of a new species within an individual's lifetime.
The evolutionary species concept is a mechanistic approach that allows direct observation of the birth of a new species within an individual's lifetime.
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The recognition species concept proposes that all members of a species share a common fertilization system called SMRS.
The recognition species concept proposes that all members of a species share a common fertilization system called SMRS.
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A new species arises under the Evolutionary Species Concept only when it acquires a new SMRS
A new species arises under the Evolutionary Species Concept only when it acquires a new SMRS
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Asexual organisms, such as bacteria, are well-defined by the biological species concept due to their ability to interbreed easily.
Asexual organisms, such as bacteria, are well-defined by the biological species concept due to their ability to interbreed easily.
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The main criteria in the biological species concept are reproductive isolation and shared chromosomes.
The main criteria in the biological species concept are reproductive isolation and shared chromosomes.
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The Evolutionary Species Concept suggests that a species is defined by its ability to interbreed with other species and produce fertile offspring.
The Evolutionary Species Concept suggests that a species is defined by its ability to interbreed with other species and produce fertile offspring.
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Study Notes
Species Concepts
- Species concept is a way to define or describe species
- Scientists have different criteria for defining species
- Six major species concepts are discussed
Major Species Concepts
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A. Morphological Species Concept (Typological):
- Species are defined by shared morphology (physical characteristics)
- Similarly looking organisms are considered same species
- Problems: Sibling species (morphologically similar, but don't interbreed)
- Issues: Sexual dimorphism (males and females look different), Polymorphism (species with multiple forms)
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B. Biological Species Concept:
- Mayr and Dobzhansky proposed this
- Species are groups of actually or potentially interbreeding natural populations reproductively isolated from others
- Reproductive isolation is key criterion
- Common gene pool
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C. Evolutionary Species Concept:
- Species is a lineage of ancestor-descendant populations
- Maintains its identity from other lineages
- Has its own evolutionary tendencies
- Historical fate
- 6 tenets detailed in text
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D. Recognition Species Concept:
- Species are populations with shared mate recognition systems
- Organisms share common fertilization system
- Developments in mate recognition system creates new species
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E. Cohesion Species Concept:
- Species is a population with shared phenotypic cohesion due to mechanisms like fertilization, development, and natural selection
- Maintain genetic cohesion
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F. Phylogenetic Species Concept:
- Species is irreducible cluster of organisms
- Diagnostically distinct from other clusters
- Shares a common ancestor
- Parental pattern of ancestry and descent
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Description
This quiz explores various species concepts in biology, including the cohesion, phylogenetic, recognition, and biological species concepts. Understand how these definitions shape our understanding of species and their genetic coherence. Test your knowledge on the key differences and implications of each concept.
