If the two forms were unable to interbreed when their expanding ranges met, it would be an example of allopatric speciation
Geographic speciation, also referred to as allopatric speciation, is the process of biological populations of the same species becoming isolated because of geographic changes like the formation of mountains or social changes like emigration.
The species was universally acknowledged as the primary taxonomic unit of evolution during the Neo-Darwinian era. The biological species notion is one of the most widely recognized ideas about species (BSC).
The BSC claims that allopatrically created species are postzygotically isolated, meaning that they are unable to produce fruitful hybrids even when they come into touch and can interbreed.
This chapter discusses the many allopatric model of evolution verification theories, including the fundamental allopatric model, the reinforcement model, and the divergence-with-gene-flow model.
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