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Evolution, natural selection and speciation
Evolution is a change in allele frequency
1. The complete range of alleles present in a population is called a gene pool
2. New alleles are usually generated by mutations in genes ­ these are changes in the base sequence of DNA
that occur…

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Geographical isolation and natural selection lead to reproductive isolation
1. Geographical isolation happens when a physical barrier divides a population of species ­ floods, volcanic
eruptions and earthquakes can all cause barriers that isolate some individuals from the main population
2. Conditions on either side might be slightly different.…

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