define two modes of speciation and provide examples of each Solution Speciation: A species is a group of organisms capable of interbreed and produce fertile offspring. Speciation is a process of evolution in biological population. Speciation gives distinct population over time. There are various mode of speciation as follows: 1. Allopatric speciation: Any geographic, climatic or anthropogenic barriers in population split the population in two or more. These populations evolve in own way to accumulate mutations leads to genetic divergence. Example: Isthmus of Panama 2. Peripatricspeciation: When a migrated population grow in a different ecology and adapts to that environment causes to form a sub-species is called Peripatric speciation speciation. Examples: organisms at oceanic island 3. Sympatric Speciation: When two or more species arises from a single parent species known as sympatric speciation within same geographic environment. Example: Nicaragua crater lake cichlid fishes evolves by Sympatric Speciation..