This text's step-by-step method reveals the logic behind genetic experiments and the interpretation of experimental data, thereby emphasizing critical thinking. Russell continues to demystify genetics by incorporating problem-solving techniques, including solved end-of-chapter problems, and additional questions and problems. This fourth edition features a reorganization of chapters which includes a new introductory chapter, updated coverage of molecular genetics, new chapter-ending problems, new and revised art, and new chapter-opening photographs with captions.