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Definition
| The formation of new species in populations that are geographically isolated from one another. |
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Definition
| A fertile individual that has more than two chromosome sets as a result of two different species interbreeding and combining their chromosomes. |
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Definition
| An individual that has more than two chromosome sets that are all derived from a single species. |
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Term
| biological species concept |
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Definition
| Definition of a species as a group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring, but do not produce viable, fertile offspring with members of other such groups. |
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Term
| ecological species concept |
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Definition
| A definition of 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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Definition
| Offspring that results from the mating of individuals from two different species or from two true-breeding varieties of the same species. |
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Definition
| A geographic region in which members of different species meet and mate, producing at least some offspring of mixed ancestry. |
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Definition
| Evolutionary change below the species level; change in the allele frequencies in a population over generations. |
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Definition
| A chromosomal alteration in which the organism possesses more than two complete chromosome sets. It is the result of an accident of cell division. |
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Definition
| In evolutionary biology, a process in which a process in which natural selection strengthens prezygotic barriers to reproduction, thus reducing the chances of hybrid formation. Such a process is likely to occur only if hybrid offspring are less fit than members of the parent species. |
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Definition
| The existence of biological factors (barriers) that impede members of two species from producing viable, fertile offspring. |
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Definition
| An evolutionary process in which one species splits into two or more species. |
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Term
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Definition
| A population or group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring, but do not produce viable, fertile offspring with members of other such groups. |
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Term
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Definition
| The formation of new species in populations that live in the same geographic area. |
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