This companion is designed to use with Genes VI by Benjamin Lewin. It helps students to make the best use of their study-time as they progress through the main text. The companion follows the organization of that book closely. For each Part there is a summary of the basic themes, and for each chapter there are six basic (1) Multiple-choice questions; (2) Suggested additional reading; (3) A checklist of key terms; (4) Concept questions; (5) Problems; (6) Summary worksheets (presented as a fill-in-the-blank exercise). Full answers are provided for all these at the end of the book, The book will be an invaluable resource for students using the main text as part of an undergraduate course in genetics. use of their study-time.