Clearly, genetics are at work in heredity, predisposition to disease, and physical characteristics. Yet, environment can also reduce the possibility of disease or bad behavior. Genetics and environment both contribute to our overall being in much the same way that both height and width contribute to the area of a rectangle.
Genetics are certainly a powerful force of nature that rules outcomes above and beyond our conscious control. We cannot control our eye color or the number of fingers we grew as children. Still, "to concede that some people are genetically encoded to have shorter fuses than others or are more likely to gain weight if granted unlimited access to Oreos is hardly to embrace a view of humans as lumbering robots ruled by genes" (Shea). However, the question does linger as to how much of our behavior is really outside our control. Our belief in free will may be little more than the rationalization for the actions that we are destined to take.
There is a sensible limit to the power of genetics as expressed in nature. According to Lamm and Jablonka, "an organism with the same genotype can develop along different trajectories, depending on the inputs it receives" (Lamm and Jablonka 309). This leads to evolutionary changes, as well as identical twins with markedly different abilities and attitudes. ...Show more