Genetic Drift is also known as an allelic drift. This is the change of the frequency of a gene allele throughout a given population. This is a result of the random sampling of organisms. This is one of the fundamental traits of evolution. Genetic drift affects the makeup of a given population through its random process and it doesn’t produce adaptations.
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An example of this is a population of red and blue marbles that represent different alleles. There are 20 alleles in total, 10 red and 10 blue. The next jar or next generation that has 20 marbles of random colors. Selected at random, the marbles will not be even as the first generation. As long as they are not the same 50% blue and 50% red, there is random genetic drift occurring. This process can continue until the red marbles are eliminated from the population.
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