Jeev vigyan Textbook for Class XII is an NCERT textbook which follows the guidelines of NFC in letter and spirit. This book will help students of Class XII become familiar with the diversity of biological material and make them understand the concepts. Jeev vigyan Textbook for Class XII contains five units, the first of which covers reproduction in organisms, humans and flowering plants. Genetics and Evolution is the second unit and here students can learn about the principles and molecular basis of inheritance. This section also covers the structures and functions of genetic material.