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Genetic drift is one of the three forces that affect evolution in a big way. The other two are selection and mutation. Random Genetic Drift causes changes in the phenotypes and genotype over a period of time. It also determines the kind and degree of variation within a population of a species. In the real world there is also a lot dependant on the factors of fortune chance with the reproduction and survival of any organism being subject to accidents that are entirely unpredictable. Genetic drift is a kind of statistical effect that is the outcome of influence that it brings about making an allele rarer or more common over several generations. Genetic drift is not predisposed towards a particular direction and a decrease or an increase is equally likely.
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