This reference work comprehensively covers the principles and causes of normal and abnormal human development, at the molecular genetic, evolutionary, and morphological levels. Its emphasis is on illustrating the relationship between developmental mechanisms and evolution in humans. Authored by leading authorities in the field, the book describes the firm historical context and offers a major focus on evolutionary aspects of morphogenesis. The text is extensively illustrated with photographs and diagrams, and includes comparisons with animal models to illustrate principles of phenotypic and causal analyses of development. Written in a clear, accessible language, the book is an invaluable resource for non-specialists and specialists alike.