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It’s safe to say that most people – not just the (wo)man in the street but also biologists – work on the assumption that genetics explains what we are, or at least our bodies. There is, of course, a nature-nurture debate concerning many of our mental functions. Clearly, genetics doesn’t explain which language we speak. And there’s a thing called epigenetics: the influence of our environment on how we develop. If you eat too much you get fat, work out in the gym and your muscles grow. But the fact that we’ve got two arms and two legs, a heart that beats, eyes that see – that’s all genetics, rig