Over the course of evolutionary time, what should occur?

Question

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Over the course of evolutionary time, different strains and variations of bacteria and bacteriophages should arise and be maintained through natural selection. This means that both methylated and nonmethylated strains should be present among both bacteria and bacteriophages, with ratios that may vary over time as environmental pressures and selective forces change. However, it is unlikely that either methylation or nonmethylation would become fixed in the gene pools of either type of organism, as this would limit their ability to adapt and evolve in response to new challenges.

Over the Course of Evolutionary Time, What Should Occur