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Q&A: What turns your genes on and off?

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Q: I thought I was born with my genes (some from Mom, some from Dad), and they made me who I am. Now I hear that how you live day-to-day turns genes on and off. Does that change who I am, basically? - Mitch D., Mystic, Conn. A: You were born with a set of genes. The DNA-containing chromosomes in those genes determine your gender, your eye color, even your sensitivity to sound. But not all genes...

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