Note: Scally examines the history of genetic science, from Darwin through the eugenics theories of the first half of the 20th century, to the cloning of Dolly the sheep in 1997. Looking at relatively recent developments like organ transplantation and DNA testing, he argues for the establishment and implementation of a comprehensive code of ethics in the area of genetic science in order to safeguard the integrity and infinite variety of the human race. He readily accepts, however, that not all genetic experimentation is bad, and believes that many aspects of genetic engineering, particularly in the area of food production, can only be of benefit to humankind.