Back Mutation

Back mutation
A reversion event which restores the original DNA sequence.
Bacteriophage (or simply Phage)
A virus that infects a bacterium.
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Back Mutation: Reverse the effect of a point or frame-shift mutation that had altered a gene; thus it restores the wild-type phenotype (see Revertant).
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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.
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once the least mutated genomes in an asexual population begin to carry at least one (additional) bad mutation, no genomes with fewer mutations can be expected to be found in future generations (except as a result of highly unlikely back mutation).
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Back mutations. These mask the changes that preceded them and make branches look shorter than they should be.
Gene transfer between species.
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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 ...
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