- Isolation is where populations of species are separated - can happen due to a physical barrier (floods or earthquakes can barriers that geographically isolate populations)
- Conditions on either side of the barrier will be different (climates)
- Since the environment is different on each side, different characteristics will become more common in each population due to natural selection operating differently on the populations
-Each population shows genetic variation because they have a wide range of alleles - in each population, individuals with characteristics that maek them better adapted to survive in their environment will have a better chance of breeding successfully - alleles that control the beneficial characteristics are more likely to be passed on to the next generation
- Eventually, individuals from the different populations will have changed so much that they won't be able to breed with one another to produce fertile offspring
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