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21 Cards in this Set
- Front
- Back
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1. What are the concepts of speciation?
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1. Morphological species concept
2. Ecological species concept 3. Recognition species concept 4. Biological species concepts |
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What is the morphological species concept?
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not right physical equipment
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What is the ecological species concept?
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species is adapted to a particular environment, set of resources
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What is the recognition species concept?
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behavior barriers
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What is the biological species concept?
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each species has a gene pool separate from other species and reproductive barriers restrict interbreeding.
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What are reproductive isolation in biological species?
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Prezygotic reproductive barriers and postzygotic reproductive barriers
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What are some prezygotic reproductive barriers
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1. Temporal isolation
2. Habitat isolation 3. Behavioral isolation 4. Mechanical isolation 5. Gametic isolation |
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What is temporal isolation?
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Reproduce at different times
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What is habitat isolation?
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Live and breed in different areas; is a prezygotic reproduction barrier
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What is behavioral isolation?
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Courtship, behavioral rituals, etc.
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What is mechanical isolation?
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structural differences
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What is gametic isolation?
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egg and sperm are incompatible
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What are some postzygotic reproductive barriers
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1. Hybrid inaviability
2. Hybrid sterility 3. Hybrid breakdown |
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What is hybrid inviability?
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embroys die; postzygotic barrier
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What is hybrid sterility?
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able to survive outside, but sterile (unable to reproduce); postzygotic reproductive barrier
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What is hybrid breakdown?
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inability to reproduce because of some genetic defect; postzygotic barrier
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What is a hybrid zone?
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Locations where the hybrids of two divergent populations are prevalent and form a cline
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What are the two types of speciation?
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a. Allopatric
b. Sympatric |
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1. What is allopatric speciaton?
2. Example? 3. Adaptive radiation? |
1. Geographic isolation leads to natural selection or genetic drift
2. Kabib/Albert squirrel in Grand Canyon 3. evolution of ecological and phenotypic diversity w/in a rapidly multiplying lineage |
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1. What is sympatric speciaton?
2. Example? |
1. A new species evolves within the same geographic region as th parent species. Occurs due to change in ploidy or change in ecology
2. Plants - change in number of chromosomes |
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How is speciation reflected in time and patterns?
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By punctuated equilibrium and gradualism
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