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take for an example there are many beetles on a mountain there will also be many sub groupssince the beetles wont travel far away for food or mate and hence will mate in a small region forming many sub groups.

now a beetl somehow (carried by crow)reaches anothe sub group .it will surely mate with a female there and there will bw a gene flow from one sub population to another .

now for ex a river is formed between 2 sub populations then this type of gene flow will bwcome even less .over years the 2 sub population will mate and both genetic drift and natural selection will create big changes in the 2 populations ,

the changes will become so big tha t the 2 polations will not be able mate with each other .creating two diff seicies

this is called genetic isolation or speciation

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16y ago

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