Back mutation is a change in a nucleotide pair of a point-mutated DNA sequence that restores the original sequence and hence the original phenotype.[2]
[edit] Frameshift mutation
Main article: Frameshift mutation ...
The back mutation can occur or a compensating mutation can occur. Since mutations occur at random, the probability that the next mutation occuring in the lineage is the back mutation is low.
Back mutations. These mask the changes that preceded them and make branches look shorter than they should be.
Gene transfer between species.
In order to answer this question they assumed first, that there were a large enough number of alleles so that any mutation would lead to a different allele (that is the probability of back mutation to the original allele would be low enough to be ...
 See also: Mutation, Gene, Environment, DNA, Mutation rate
  
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