What is speciation? Explain the mode of speciation.

Speciation is the process by which new and distinct species evolve from a single ancestral species. This divergence occurs when populations of a single species become reproductively isolated from each other, preventing gene flow between them. Over time, genetic, behavioral, and ecological differences accumulate between the isolated populations, leading to the formation of two or more species. Speciation is a central concept in evolutionary biology and helps explain the vast diversity of life forms on Earth.

There are two primary modes of speciation: allopatric speciation and sympatric speciation, with additional modes like parapatric and peripatric speciation.

### Allopatric Speciation
Allopatric speciation occurs when a population is geographically divided into two or more isolated groups, usually by a physical barrier such as a mountain range, river, or desert. This isolation prevents gene flow between the groups, leading to genetic differentiation over time. As each group is exposed to different environmental conditions, natural selection, genetic drift, and mutation act independently in each ___ _______ ___ __________ ___.
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