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9 Cards in this Set
- Front
- Back
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Biological Species Concept
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"groups of actually or potentially interbreeding natural populations, which are reporductively isolated from other such groups"
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Isolating mechanisms prevent________--
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interbreeding
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Premating mechanisms
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Mechanisms that prevent mating attepts:
GET BM Geography Ecology; (diff resources used) Temporal (differ time/season for mating) Behavior (Diff display and coutship) Mecanical: reproductive organs not compatible |
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Post-mating mechanisms
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mating occurs, but is not viable
Gametic incompatibility: mating ocruse but fertilization does not Hybrid inviability hybrids do not survive, or is less successful than teh paretns hybrid infertility: hybrids are infertile |
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Speciation depends on 2 things:
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1. Population Isolation (prevents gene/allele flow between groups
2. Genetic divergence: development of large genetic differences (by chance or natural selection)_ |
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Ways to Speciate
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Allopatric: two populations geographically separated
Habitat division: geographic, climate, or landscape change separates populations Natural selection and genetic drift further isolate population Sympatric SpeciationL population isolation without gepgraphic separation (sym-same) ex. flies on two diff trees |
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Adaptive Radiation
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many speciation events in a short time
populations invade a variety of new habiltats |
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Ways to Become extinct
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Localized distribution- only found in small area
Overspecialization: can only survive in certain environments Species interations: comptitoin and predation |
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Systematics
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relating species to species and figuring out where they diverged
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