Intended as a supplement to upper-division courses in personality, developmental psychology, environmental psychology and cognition, this book presents an overview of the methods and findings of behavioural genetics. Designed for undergraduates, it discusses heredity, molecular genetics, and the effects of heredity on behaviour. The author emphasizes both environmental and hereditary influences and provides a balanced look at behavioural genetics, including concise and up-to-date research findings and methods. This text discusses the part heredity plays in: IQ and memory; alcoholism, depression, and schizophrenia; sociability, activity, and other aspects of personality; our reactions to experiences; and similarities among children raised in the same family.