What is genetic drift? Why is it necessary?
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There are two main mechanisms of evolution, natural selection and genetic drift. Genetic drift occurs when the frequency of an alleleAllele:
An alternative form of a gene; one of the different forms of a gene that can exist at a single locus. changes over generations due to random chance. Evolution due to genetic drift is not caused by environmental or other kinds of stresses on individuals, and the resulting random changes can be detrimental, neutral, or beneficial to the reproductive success of the following generation.
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