Little more than a decade ago, in the early 1980s, the term 'genetic engineering' was hardly known outside research laboratories. By now, though, its use is widespread. Those in favour of genetic engineering - and those against it - tell us that it has the potential to change our lives perhaps more than any other scientific or technological advance. But what are the likely consequences of genetic engineering? Is it ethically acceptable? Should we be trying to improve on nature? The authors, a biologist and a moral philosopher, examine the implications of genetic engineering in every aspect of our lives. The underlying science is explained in a way easily understood by a non-biologist, and the moral and ethical considerations that arise are fully discussed. Throughout, the authors clarify the issues involved so that readers can make up their own minds about these controversial issues.