Geographic Isolation

Geographic Isolation
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  • Geographical Isolation is the separation of a population caused by a physical barrier. The barrier can be something like a mountain, a body of water, or a natural disaster. 
  • The fish start out in one river. 
  • When the river hits an obstacle, whether that might be a continental drift or a large rock that doesn't quickly erode, the river splits in two or more streams. 
  • This barrier splits the organisms in the river.
  • When the fish split into two or more bodies of water, they change genetically. 
  • The fish have changed genetically. They are now two different species. The splitting of a species due to geographical barriers or disturbances is geographical isolation.
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