Genetic epidemiology plays a key role in discovering how genetic factors influence health and disease, and environmental factors. Written in an easily accessible style, it is the essential resource for graduate students. It begins with an initial overview of the subject and key concepts. Unlike other texts available, it focuses on practical, population-based research methods, and their applications, rather than laboratory or statistical methods. It describes methods for assessing the magnitude of genetic influences on disease and risk factors. It includes a review of ethical issues. It is suitable for students and lecturers in epidemiology and public health genetics.