Elaborate how genetic drift and gene flow contribute towards evolution
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Genetic drift causes evolution by random chance due to sampling error, whereas natural selection causes evolution on the basis of fitness. ... Alleles that improve fitness are likely to increase in frequency, while alleles that reduce fitness will decrease in frequency.
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- Genetic drift is the process by which deviations in expected allele frequencies develop in finite populations over time as a function of statistical sampling of genes from one generation to the next (as opposed to deviations that may develop in finite populations due to selection, mutation, or admixture
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