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Blaine: The
Indian languages all show traces of Hebrew, but are otherwise very
different--what does that prove? Just that 2500 yrs have gone by, and
languages change at a rapid pace. The same with genetic
similarities. It is called genetic drift.
Ho hum.
Now let's consider the effects of genetic drift on a population. In the short term, over a few generations, we would expect allele frequencies to increase and decrease in a random, unpredictable way, as a result of genetic drift. In the longer term, the main result of genetic drift is loss of genetic variation. This occurs because over time, at random, there will be a generation in which one allele (which has become rare by chance) will not get passed at all to the next generation. Given enough time, this will always be the effect of genetic drift -- by chance, alleles will be lost. The smaller the population, since genetic drift has a stronger effect in small populations, the more quickly genetic variation will be lost. Genetic drift also results in different populations becoming genetically different from each other because by chance, different alleles will become fixed in different populations.
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