Gametic And Geographic Isolation
A short claymation video illustrating the basics of geographic isolation.
Despite the fact that geographic isolation can occur, there is always a chance that species will meet again. http://www.zo.utexas.edu/faculty/sjasper/images/24.8.gif
What was once a continuous population is divided into two or more smaller populations. This can occur when rivers change course, mountains rise, continents drift, or organisms migrate. The geographic barrier isn't necessarily a physical barrier that separates two or more groups of organisms — it might just be unfavorable habitat between the two populations that keeps them from mating with one another.
University of California Museum of Paleontology's Understanding Evolution
What geographic isolation looks like.
Photo credit: http://www.goldiesroom.org/
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