Understanding Genetics

All traits and personality characteristics, from height to fear of heights, are driven by a complex interplay of genes and environmental feedback. We now know that the lion's share of human genes are expressed in the brain and that almost all normal and disordered behaviors are polygenic, meaning that they are influenced (not to say caused) by multiple genes. Scientists are therefore tasked with a massive but increasingly plausible mission: mapping the pathway from genes and mediating forces to the person you see in the mirror (known in biological parlance as the "phenotype").

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