Turning genes on and off as needed allows an organism to adapt to changes in the environment—provided the organism has a specific regulatory design in place. Scientists from the Institute of Science and Technology Austria (IST Austria) have shown that under rare or rapidly changing conditions, the fitness of a population of bacteria can increase simply by producing a higher number of copies of one and the same gene. The results are highly relevant in combating resistance to antibiotics.
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Source: Phys.org