In a hypothetical experiment, researchers sequence a gene from a colony of bacteria at various times in the history of the colony.In the common ancestor, the nucleotide at site 998 is A.After 1,500 generations, it changes to G.After 5,000 generations, it changes back to A.This is an example of a(n)

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The change from A to G and back to A at site 998 represents a reversion, where a nucleotide returns to its original state after undergoing a mutation.

In a Hypothetical Experiment, Researchers Sequence a Gene from a Colony