First is whether genes are important determinants of behaviour, and I think they are. More importantly I think it’s silly to see human life as a tug of war between genes and environment (and the study of human life as a tug of war between geneticists and social scientists!).

The second issue though is whether knowing your DNA will alter your understanding of “yourself”. I think the answer here is almost certainly not because if you have a genetic variant which makes you, say, shy, then you already know about it – you’ll know that you’re shy. And so on. Or if you don’t know that you’re unusually shy, you’re not going to find out by looking at some DNA, but by interacting with other people, or through therapy, or whatever. And indeed most people who are, say, shy, already (implicitly) attribute this to their biology in that they see it as something they were “just born with”.

So in that respect I can’t see how finding out your DNA is going to alter your self-concept at all.