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The recent news of the successful cloning of an adult sheep— in which the sheep's DNA was inserted into an unfertilized sheep egg to produce a lamb with identical DNA—has generated an outpouring of ethical concerns. These concerns are not about Dolly, the now ....

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.... a clone is a separate person from his or her non-contemporaneous twin. To think otherwise is to embrace a belief in genetic determinism—the view that genes determine everything about us, and that environmental factors or the random events in human development are utterly insignificant. The overwhelming consensus among geneticists is that genetic determinism is false. As geneticists have come to understand the ways in which genes operate, they have also become aware of the myriad ways in which the environment affects their "expression." The genetic contribution to the simplest physical traits, such as height and hair color, is significantly ....