Speciation occurs when organisms diverge after experiencing different sets of environmental pressures. Organisms belong to different species when they can no longer interbreed to produce viable offspring. More »

The steps of speciation are reproductive isolation and genetic change. In many cases, reproductive isolation occurs prior to genetic changes, but they can happen simultaneously as well. In either case, speciation results... More »

Allopatric speciation is the division of species by geographical means. In the process of allopatric speciation, an extrinsic factor, or factors, prevents two or more groups of organisms from interacting or mating with e... More »

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Peripatric speciation is a special case of allopatric speciation in which a comparatively small group of organisms becomes isolated, usually geographically, from the main population. An example of a condition that encour... More »

Sympatric speciation occurs when populations of the same species become reproductively isolated from each other due to breeding preferences. This most often occurs in plants that exhibit polyploidy, a disorder in which c... More »

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Geographic isolation causes speciation because members of a population are unable to reproduce with one another. This reproductive isolation prevents mixing of the gene pool and allows each population to evolve along dif... More »

The steps of speciation are reproductive isolation and genetic change. In many cases, reproductive isolation occurs prior to genetic changes, but they can happen simultaneously as well. In either case, speciation results... More »