In recent years, the pace of development in the field of biology has accelerated and has raised new ethical questions. This revised edition of the Main Issues in Bioethics reports on the important changes that have taken place during the past four or five years and evaluates their moral implications. At the same time, the updated edition retains the structure and method of the first. If offers a systematic approach to the major questions of bioethics. It surveys and discusses these issues in a concise and consistent way, providing a comprehensive overview of the pertinent scientific background and data for each issue discussed.