In the last few years, dramatic advances in molecular biology have made it possible to analyze human genes directly, providing new insights into human molecular pathology and leading to techniques used for such procedures as the prenatal diagnosis of genetic disorders. Written for nonspecialists by an internationally-known expert, this unique book provides a clear introduction to the new genetics and an in-depth consideration of the impact this technology may have on the future practice of medicine. Weatherall describes recombinant DNA techniques and outlines how they are used to analyze genes; reviews what is known about the molecular pathology of human genetic diseases and about acquired disorders like cancer; and assesses how these methods might be used for preventive genetics and gene therapy. For this new edition, many of the illustrations have been redrawn and revised, and new figures added to clarify the discussion. The book will continue to be a valuable resource for doctors, nurses, and counselors who need to understand the new molecular tools available to them.