I also added a bit about dyslexia, which is closely linked with three genes. The genes involved include DCDC2, active in reading centres in the brain; and Robo1, which develops the corpus callosum connecting the two halves of the brain during foetal development.
The total picture is of a species that copes with multiple inherited dysfunctions. Many of our psychological ills result from the fact that our underlying psychological processes are leftovers from previous eras when life was much more simplistic and machiavellian. Prof Dietrich from the Philosophy Department at Binghamton University bemoans this history, stating that "it is a sad fact that much of our basic human psychology is built by evolution. These innate psychological capacities of ours are principally responsible for many of humanity's darkest ills. But in short, we abuse, discriminate, and rape because we are human"17. Genetic diseases are inherited or are made present from the moment of conception and do not result from any choice of lifestyle. Such random suffering is hardly the hallmark of a well-designed genetic system. Genetic diseases and undesirable personality traits afflict us because evolution is imperfect in its mechanism and blindly progresses down roads that can later turn out to be harmful.