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Overview of Gene Switch The notion that genes might be turned on and off was discovered several decades ago when studies revealed that E. coli bacteria, as well as lambda bacteriophage, can adapt to the alterations in the composition of their nutrient medium.
It’s because certain genes act one way on some people… and another way on other people. Putting this in medical jargon, the gene ‘expresses’ one way with Bob, for example, and a completely different way with Mary. How a geneexpresses – that is, how the gene affects you – goes on to determine whether you get ill or not.
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