Term
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Definition
| the process by which one species splits into two or more species |
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Term
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Definition
| changes over time in allele frequencies in a population |
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Term
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Definition
| the broad pattern of evoltuion over long time spans |
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Term
| biological species concept |
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Definition
| generally accepted definition of a species; members can interbreed |
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Term
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Definition
| a group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring |
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Term
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Definition
| the existence of biological factors that impede members of two species from producing viable, fertile offspring |
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Term
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Definition
| offspring that result from an interspecific mating |
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Term
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Definition
| "before the zygote"; contribute to reproductive isolation after the hybrid zygote is formed |
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Term
| morphological species concept |
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Definition
| views a species in terms of its ecological niche; the sum of how members of the species interact with the nonliving and living parts of their environment |
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Term
| phylogenetic species concept |
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Definition
| defines a species as the smallest group of individuals that share a common ancestor |
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Term
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Definition
| gene flow is interrupted when a population is divided into geographically isolated subpopulations |
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Term
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Definition
| speciation occurs in populations that live in the same geographic area |
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Term
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Definition
| a condition in which a species may originate from an accident during cell division that results in extra sets of chromosomes |
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Term
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Definition
| an individual that has two or more chromosome sets that all derived from a single species |
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Term
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Definition
| an organism derived from a hybrid mating that can only mate with other similar allopolyploids and neither of the parent species |
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Term
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Definition
| a region in which members of different species meet and mate, producing at least some offspring of mixed ancestry |
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Term
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Definition
| the process by which prezygotic barriers to the reproducing of hybrids are strengthened |
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Term
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Definition
| a species remains unchanged for long periods of time and then suddenly changes drastically or disappears altogether |
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