Book excerpt: Genomic imprinting allows scientists to trace genes to the parent of origin. This volume presents a collection of 13 papers by David Haig (organisimic and evolutionary biology, Harvard U.) on genomic imprinting. He argues that our paternally and maternally active genes do not work in cooperation with each other and in fact are in competition. Each paper is followed by commentary by the author, providing background information and discussing developments since its publication. Annotation copyrighted by Book News Inc., Portland, OR.