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GENDRIFT - Genetic Drift genetic drift random change in...

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Genetic Drift genetic drift-  random change in gene frequency due to chance. With a large population chance factors have little effect on gene frequencies.   But with  small populations, chance factors may produce random changes in gene frequency. Example:  If we flip a quarter, we expect 50% heads and 50% tails.  If we flip the  coin 1000 times, we get results very close to the 50:50 ratio.  But, if we flip the quarter only  4 times, we may get 3 heads and 1 tail or all heads or all tails.  When the sample size is  small, or in this case flips, then sampling error can be large.  All genetic drift arises from   such sampling error.   Causes   Genetic drift arises  when   population  size  remains  continuously   small   over  many  generations. All genetic drift arises from sampling error, but there are several ways in which 
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