5) Over time, colonial populations become genetically divergent from their parent population due to natural selection, mutation, and/or genetic drift. d) punctuated equilibrium. Isolation was also an evolutionary concept before Punctuated Equilibrium. It splits the gene pool apart, so no more genetic mixing. Typically geographic isolation is the result of an accident or coincidence. Isolated groups may experience different selection pressures and diverge, eventually, into different species. Historians again suggest that the nation’s geographical isolation from Europe continued to allow the U.S. to avoid the “entangling alliances” feared by the Founding Fathers. One such place is Lake Victoria in Africa, famous for its sympatric speciation of cichlid fish. e) prezygotic isolation. Hyalella an ideal system for quantifying the factors that contribute to the evolution of reproductive isolation. Problem — Evolution biologists have been faced with an Yes, geographic isolation does contribute to evolution. c) sympatric speciation. The model of speciation that requires some time with geographic barriers between two populations, allowing evolution of reproductive isolation, is a) allopatric speciation. This scenario does play out in nature, as do others that lead to reproductive isolation. Question: How does geographic isolation contribute to evolution? how does geographic isolation contribute to evolution?? The objectives of this study were to address three questions regarding the patterns of reproductive isolation among Hyalella lin-eages: (i) “What role does geographic isolation … The two populations could overtime not be able to breed due to evolution. How does geographic isolation contribute to speciation? Certain geographic features isolate a small number of individuals from the rest of the poopulation. Darwin postulated that the finches were unique on the Galapagos Islands because of their "geographic isolation." https://www.onlinelibrary.wiley.com/doi/full/10.1002/ece3.3474 Return to top. Researchers have found hundreds of sympatric speciation events in these fish, which have not only happened in great number, but also over a short period of time. 4) Geographic isolation reduces gene flow between populations. Speciation: Speciation is the evolutionary process by which two populations become separate species. Geographic isolation is a term that refers to a population of animals, plants, or other organisms that are separated from exchanging genetic material with other organisms of the same species. When populations are geographically separated they can't exchange alleles and mutations stay within a population. 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