The purpose of writing this book is to provide comprehensive knowledge that is easy to understand and to provide unambiguous material related to genetics, various genetic disorders, treatments and genetic counselling for the graduate and post-graduate students. All the unnecessary details have been avoided so that the students may not face any difficulty in preparation for examinations. Review questions given at the end of each chapter will help students in evaluating themselves. This book will assist nurses to gain access to current genetic information, genetic diagnosis, treatment and management. Nurses can collect accurate family history, provide current and relevant information and support to an individual patient’s families and communities.