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Increasingly, genes are being linked in the mainstream press, on the Web and also in prestigious medical journals not only to medical conditions but also to behavioral conditions such as narcissism, aggressiveness, and in some instances to voting behavior. Linking disease to specific genes is becoming progressively more common among the American public, too. The increasing perception is that an individual's genes are the main cause of disease.
The "geneticizing" of disease is used most appropriately in those instances where we know that genes or gene variants alone can cause disease--such as Tay-Sachs disease, which is prevalent among the descendants...