A true reversion (reverse mutation) is a mutation which changes a mutant allele back into a wild type allele (for example, in the previous example, a reversion would be anohter mutation at exactly the same location of the first mutation, hwich simply reverses the change made the first time, changing the albino allele back into a wild type [normal] allele). As you might expect, true reversions are much less common than forward mutations because the "target area" is much smaller. A typical gene is hundreds of bases long; a forward mutation can be achieved by altering any one of many of those bases. But a reversion must hit exactly the previously altered base, and must alter it in such a way as to change it back to what was originally in that position
http://www.cod.edu/people/faculty/fa...s/mutation.htm
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