The Justice System: A Genetic Analysis

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I am intrigued by the Behavior Genetics aspect of this chapter. What exactly helps mold a person? Is it more genetics or surroundings? I found a blog posting by Virginia Hughes titled, My DNA made me do it? How Behavioral Genetics is influencing the Justice System. I found it very interesting and basically this is what I get from what she says.
Behavioral genetics is the study of genetic and environmental influences on behaviors. By examining genetic influence, more information can be gleaned about how the environment operates to affect behavior. Almost all behaviors studied by psychologists are affected by our genetic makeup, and so the question is not whether genes are important, but how do they affect these behaviors? The old nature–nurture