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11 Cards in this Set
- Front
- Back
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biological species concept
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definition of a species as a group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring, but don't do so with other groups
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reproductive isolation
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existence of biological factors (barriers) that impede members of 2 species from producing viable , fertile offspring
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hybrid
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offspring that result from mating individuals of two different species
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prezygotic barriers
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reproductive barrier that impedes mating btwn species or hinders fertilization of inter specific mating is attempted
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postzygotic barriers
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reproductive barrier that prevents hybrid zygotes produced by two different species from developing into viable, fertile adults
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prezygotic barriers
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1) habitat isolation
2) temporal isolation 3) behavioral isolation 4) mechanical isolation 5) gametic isolation |
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postzygotic barriers
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1) reduced hybrid variability
2) reduced hybrid fertility 3) hybrid breakdown |
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allopatric speciation
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formation of new species in populations that are geographically isolated from one another, once geographic separation has occurred, separated gene pools may diverge
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sympatric speciation
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the formation of new species in population that live in the same geographic area, can occur if gene flow is reduced
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polyploidy
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chromosomal alteration where organism possesses more than 2 complete chromosome sets, result of cell division accident
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hybrid zone
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geographic region in which members of different species meet and mate, producing at least some offspring of mixed ancestry
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