Any conversation about genetic determinism has to, IMO, be prefaced with the understanding that, as the science of the human genome is essentially in its infancy, it can't be tinkered with due to ethical concerns, and the current methods of investigation are prone to causation fallacies at this stage, it has to be treated with a healthy dose of skepticism. It wouldn't be entirely inaccurate to say that in some ways we're looking at the 21st century version of phrenology.