Does Evolution Always Result In Speciation

Evolution of species remains a hot topic since Darwin’s theory of natural selection. A European initiative addressed the issue of speciation from the viewpoint of reproductive isolation.

Evolution does not always result in speciation. Evolution may occur slowly and gradually over many generations, or it may occur rapidly if selection pressure is intense. Niles Eldredge and Stephen Jay Gould in 1972 proposed that natural selection may produce rapid

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Species originate frequently by natural selection. A general mechanism by which this occurs is ecological speciation, defined as the evolution of reproductive isolation between populations as a result of ecologically-based divergent natural selection. The alternative mechanism is mutation-order speciation in which populations fix different mutations as they adapt to similar selection pressures.

Speciation is about how species form. It is a major part of evolutionary biology. Darwin thought most species arose directly from pre-existing species. This is called anagenesis: species by changing, or ‘phyletic evolution’.Now we think most species arise by previous species splitting: cladogenesis. The general view is that most species splitting is caused or helped on its way by isolating.

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Mechanisms Reproductive Isolating Mechanisms PowerPoint Presentation Allopatric speciation of squirrels in the Grand Canyon Allopatric Speciation. – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com – id: 41a918-NjMxM

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Speciation is about how species form. It is a major part of evolutionary biology. Darwin thought most species arose directly from pre-existing species. This is called anagenesis: species by changing, or ‘phyletic evolution’.Now we think most species arise by previous species splitting: cladogenesis. The general view is that most species splitting is caused or helped on its way by isolating.

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Speciation is about how species form. It is a major part of evolutionary biology. Darwin thought most species arose directly from pre-existing species. This is called anagenesis: species by changing, or ‘phyletic evolution’.Now we think most species arise by previous species splitting: cladogenesis. The general view is that most species splitting is caused or helped on its way by isolating.

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In turn, that means reproductive isolation is not the only definition of a species, and speciation does not always need allopatry (species to be reproductively separated). The sections below illustrate the idea that physical separation was of prime importance in the formation of new species.

Isolation of a population does not always result in speciation. There are several outcomes that can occur following isolation Depending on the circumstances, hybrid populations can serve as genetic links between isolated populations.

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There is no empirical difference between speciation and microevolution only in theory are they different. One of the best known examples of speciation and microevolution are the Darwin Finches of the Galapagos Island. There is good empirical evidence that a few finches from the mainland pioneered on the Island. These few finches adapted to the new environment in many ways. Some grew large.

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Sympatric speciation is the reproductive isolation created by genetic abnormalities not as a result of geographic isolation. Although not widespread among animals, sympatric speciation has been significant in plant variation. Hugo de Vries, a Dutch botanist, is credited with identifying polyploidy as an agent of sympatric speciation.

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