key concept 22.1 Species Are Reproductively Isolated Lineages on the Tree of Life
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We can recognize many species by their appearance
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Reproductive isolation is key
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The lineage approach takes a long-term view
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The different species concepts are not mutually exclusive
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key concept 22.2 Speciation Is a Natural Consequence of Population Subdivision
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Incompatibilities between genes can produce reproductive isolation
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Reproductive isolation develops with increasing genetic divergence
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key concept 22.3 Speciation May Occur through Geographic Isolation or in Sympatry
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Physical barriers give rise to allopatric speciation
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Sympatric speciation occurs without physical barriers
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key concept 22.4 Reproductive Isolation Is Reinforced When Diverging Species Come into Contact
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Prezygotic isolating mechanisms prevent hybridization
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Postzygotic isolating mechanisms result in selection against hybridization
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Hybrid zones may form if reproductive isolation is incomplete
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key concept 22.5 Speciation Rates Are Highly Variable across Life
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Several ecological and behavioral factors influence speciation rates
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Rapid speciation can lead to adaptive radiation
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Apply What Youâve Learned
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