Welcome to the third edition of Genetics Essentials: Concepts and Connections, a brief genetics textbook designed specifically for your one-semester course. The title Genetics Essentials: Concepts and Connections precisely conveys the major goals of the book: to help students uncover major concepts of genetics and make connections among those concepts so as to have a fuller understanding of genetics. The text maintains the features that made the first two editions so effective: simple and instructive illustrations, accessible writing style, a strong emphasis on problem solving, and useful pedagogical features throughout the book.