Recognized as the definitive reference in the field, this book addresses a broad range of biologically based disorders that affect children's learning and development. Leading authorities review the genetics of each disorder; its course and outcome; associated developmental, cognitive, and psychosocial challenges; and what clinicians and educators need to know about effective approaches to assessment and intervention. Coverage encompasses more frequently diagnosed learning and behavior problems with a genetic component as well as numerous lower-incidence neurodevelopmental disabilities. Illustrations include 12 color plates.