This textbook has been designed to meet the needs of B.Sc. Second Semester students of Zoology as per the Common Minimum Syllabus prescribed for all Uttarakhand State Universities and Colleges under the recommended National Education Policy 2020 (NEP 2020). The book has been presented in two parts, namely Genetics and Cell Biology. The first part, Genetics discusses Mendel's life, laws of dominance, segregation and independent assortment. Further, it elucidates linkages, crossing over, sex linked inheritance and mutation. Second part of the book delineates on Cell Biology, discussing prokaryotic & eukaryotic cells, structure and functions of cell organelles. Also, cell division topic including the cell cycle, mitosis and meiosis has been aptly discussed. This textbook contains simple, comprehensive, up-to-date and well-illustrated account of Genetics and Cell Biology. Also, special care has been taken to maintain clarity and authenticity of text and illustrations.