1) Isolation; population of the same species are seperated
This can happen due to physical barrier
E.g. floods, earthquakes or mountain ranges can cause barriers that geographically isolate individuals from the main popualtion
2) Conditions on either side of the barrier will be slightly different e.g. climate
3) Because the conditions are different on either side, different charateristics will become more common in each population, due to natural selection
4) Each population will show variation because htey have a wide range of alleles
5) Individuals with charateristics make them better adapted to their environment
This gives them a better chance of survival , so they are more likely to reproduce
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