Explain genetic drift, variation
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Genetic drift is change in allele frequencies in a population from generation to generation that occurs due to chance events. To be more exact, genetic drift is change due to "sampling error" in selecting the alleles for the next generation from the gene pool of the current generation.
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'genetic drift'-- variation in the relative frequency of different genotypes in a small population,owing to the chance disappearance of particular genes as individuals die or do not produce.
'variation'---the difference between the individuals in a species is called variation
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