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 numerous lower-incidence neurodevelopmental disabilities as well as more frequently diagnosed learning and behavior problems with a genetic component.