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physical isolation of two populations

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Describes why similar organisms do not interbreed because of a physical barrier?

Allopatric Speciation


What similar organisms do not interbreed because of a physical barrier?

Allopatric Speciation : NovaNet


What is believed to be the dominant mode of speciation among most groups of organisms?

The dominant mode of speciation among most groups of organisms is allopatric speciation. This occurs when populations of a species become geographically isolated from each other and over time, genetic and environmental differences accumulate, leading to the formation of distinct species.


How is symmetric speciation to allopatric speciation?

Symmetric speciation and allopatric speciation are two different processes of species formation. Allopatric speciation occurs when populations are geographically separated, leading to reproductive isolation and divergence due to different environmental pressures. In contrast, symmetric speciation refers to the process where species diverge while remaining in the same geographical area, often through mechanisms such as ecological niche differentiation or sexual selection. While both processes result in the formation of new species, they differ primarily in their geographic context and the mechanisms driving reproductive isolation.


What are the two phases of speciation?

The two phases of speciation are allopatric speciation and sympatric speciation. Allopatric speciation occurs when populations are geographically isolated, leading to genetic divergence due to natural selection, mutation, and genetic drift. In contrast, sympatric speciation happens within the same geographic area, often through mechanisms such as polyploidy in plants or behavioral changes in animals that reduce gene flow. Both processes ultimately result in the formation of new species.