We have known for centuries that we are all born with propensities towards this and that, but that we are also able to make choices. The fact that we can now d

We have known for centuries that we are all born with propensities towards this and that, but that we are also able to make choices. The fact that we can now discover the genes behind a particular propensity does not make the actions you take any or more or less of a personal responsibility than they were a century ago. There are good arguments on either side of the debate but discovering the underlying physical mechanism doesn't make any difference. Even if we discover, say, a violence gene, we can't usefully test for it because it may be present and inactive or there may be other violence genes as yet undiscovered. It doesn't tell you anything at the individual level. Genetic fatalism is currently fashionable but it is not a fact.