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Definition
| An evolutionary process in which one species splits into tow or more species |
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Evolutionary change above the species level
Ex: Origin of a new group of organisms through a series of speciation events and the impact of mass extinctions on the diversity of life and its sunsequent recovery |
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| 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 other such groups |
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| a population or group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring |
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| The existance of biological factors that impede members of two species from producing viable, fertile offspring |
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| Offspring that result from the mating of individuals from different species |
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| A reproductive barrier that impedes mating between species or hinders fertilization if interspecific mating is attempted |
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| A reproductive barrier that prevents hybrid zygotes produced by two different species from developing into viable, fertile adults |
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| Morphological species concept |
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| A definition of species in terms of ecological niche, the sum of how members of a species interact with the nonliving and living parts of their environment |
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| Phyogenetic Species Concept |
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Definition
| A defintion of species as the smallest group of individuals that share a common ancestor, forming one branc on the tree of life |
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| The formation of a new species in populations that are geographically isolated from one another |
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| The formation of new species in populations that live in the same geographic area |
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A chromosomal alteration in which the organism possesses more than two complete chromosome sets
Results of an accident of cell division |
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| An individaul that has more than two chromosome sets that are derived from a single species |
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| A fertile indivual that has more than two chromosome sets as a redult of two different species interbreeding and combing their chromosomes |
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| A geographic region in which members of different species meet and mate, producing at least some offspring of mixed ancestry |
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| in evolutionary biology, a process in which natural selection strengthens prezygotic barriers to reproduction, thus reducing the chances of hybrid formation; likely to occur only if the hybrid offspring are less fit than members of the parent species |
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Definition
| In the fossil record, long periods of apparent stasis, in which a species indergoes little or no morphological change, interrupted by relatively brief periods of sudden change |
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