Origin of Species
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| allopatric speciation | the formation of new species in populations that are geographically isolated from one another
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| biological species concept | a species is a population or group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring
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| ecological species concept | a definition of how species in terms of ecological niche, the sum of how members of the species interact with the nonliving and living parts of their environment
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| hybrid | offspring that results from the mating of individuals from two different species
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| hybrid zone | a geographic region in which members of different species meet and mate, producing at least some offspring of mixed ancestry
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| macroevolution | evolutionary change above the species level, including things such as major changes in anatomy and the effect of mass extinctions
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| microevolution | evolutionary change below the species level; change in the allele frequencies in a population over generations
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| morphological species concept | a definition of species in terms of measurable anatomical criteria
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| phylogenetic species concept | a definition of species as the smallest group of individuals that share a common ancestor, forming one branch on the tree of life
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| polyploidy | a chromosomal alteration in which an organism possesses more than two complete chromosome sets. It is a result of an accident of cell division.
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| postzygotic barrier | a reproductive barrier that prevents hybrid zygotes produced by two different species from developing into viable, fertile adults
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| prezygotic barrier | a reproductive barrier that impedes mating between species or hinders fertilization if interspecific mating is attempted
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| punctuated equilibrium | in the fossil record, long periods of apparent stasis, in which a species undergoes little or no morphological change, interrupted by brief periods of sudden change
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| reinforcement | a process in which natural selection strengthens prezygotic barriers to reproduction, thus reducing the chances of hybrid formation
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| reproductive isolation | the existence of biological factors (barriers) that impede members of two species from producing viable, fertile offspring
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| speciation | an evolutionary process in which one species splits into two or more species
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| species | a population or group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring
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| sympatric speciation | the formation of new species in populations that live in the same geographic area
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Created by:
mrariail