Key Points.These learning aids appear at the end of each major section in a chap- ter.They are designed to help students review for exams and to recapitulate the main ideas of the chapter. .Focus On Boxes.Throughout the text,special topics are presented in separate Focus On boxes.The material in these boxes supports or develops concepts,tech- niques,or skills that have been introduced in the text of the chapter. .On the Cutting Edge Boxes.The content of these boxes highlights exciting new developments in genetics-often the subject of ongoing research. Problem-Solving Skills Boxes.Each chapter contains a box that guides the student through the analysis and solution of a representative problem.We have chosen a problem that involves important material in the chapter.The box lists the facts and concepts that are relevant to the problem,and then explains how to obtain the solution.Ramifications of the problem and its analysis are discussed in the Student Companion site. Solve It Boxes.Each of these boxes poses a problem related to concepts students encounter as they read the text.The step-by-step solution to each of the problems is presented in the Student Companion site,and for selected problems,it is pre- sented in video format.The two Solve It boxes in each chapter allow students to test their understanding of key concepts. Basic Exercises.At the end of each chapter we present several worked-out prob- lems to reinforce each of the fundamental concepts developed in the chapter. These simple,one-step exercises are designed to illustrate basic genetic analysis or to emphasize important information. Testing Your Knowledge.Each chapter also has more complicated worked-out problems to help students hone their analytical and problem-solving skills.The problems in this section are designed to integrate different concepts and tech- niques.In the analysis of each problem,we walk the students through the solution step by step. ● Questions and Problems.Each chapter ends with a set of questions and prob- lems of varying difficulty organized according to the sequence of topics in the chapter.The more difficult questions and problems have been designated with colored numbers.These sets of questions and problems provide students with the opportunity to enhance their understanding of the concepts covered in the chapter and to develop their analytical skills.Also,some of the questions and problems- called GO problems-have been selected for interactive solutions on the Student Companion site.The GO problems are designated with a special icon. Genomics on the Web.Information about genomes,genes,DNA sequences, mutant organisms,polypeptide sequences,biochemical pathways and evolutionary relationships is now freely available on an assortment of web sites.Researchers routinely access this information,and we believe that students should become familiar with it.To this end,we have incorporated a set of questions at the end of each chapter that can be answered by using the National Center for Biotechnology Information (NCBD)web site,which is sponsored by the U.S.National Institutes of Health. Appendices.Each Appendix presents technical material that is useful in genetic analysis. ● Glossary.This section of the book defines important terms.Students find it useful in clarifying topics and in preparing for exams. Answers.Answers to the odd-numbered Questions and Problems are given at the end of the text. vivi • Key Points. These learning aids appear at the end of each major section in a chap￾ter. They are designed to help students review for exams and to recapitulate the main ideas of the chapter. • Focus On Boxes. Throughout the text, special topics are presented in separate Focus On boxes. The material in these boxes supports or develops concepts, tech￾niques, or skills that have been introduced in the text of the chapter. • On the Cutting Edge Boxes. The content of these boxes highlights exciting new developments in genetics—often the subject of ongoing research. • Problem-Solving Skills Boxes. Each chapter contains a box that guides the student through the analysis and solution of a representative problem. We have chosen a problem that involves important material in the chapter. The box lists the facts and concepts that are relevant to the problem, and then explains how to obtain the solution. Ramifications of the problem and its analysis are discussed in the Student Companion site. • Solve It Boxes. Each of these boxes poses a problem related to concepts students encounter as they read the text. The step-by-step solution to each of the problems is presented in the Student Companion site, and for selected problems, it is pre￾sented in video format. The two Solve It boxes in each chapter allow students to test their understanding of key concepts. • Basic Exercises. At the end of each chapter we present several worked-out prob￾lems to reinforce each of the fundamental concepts developed in the chapter. These simple, one-step exercises are designed to illustrate basic genetic analysis or to emphasize important information. • Testing Your Knowledge. Each chapter also has more complicated worked-out problems to help students hone their analytical and problem-solving skills. The problems in this section are designed to integrate different concepts and tech￾niques. In the analysis of each problem, we walk the students through the solution step by step. • Questions and Problems. Each chapter ends with a set of questions and prob￾lems of varying difficulty organized according to the sequence of topics in the chapter. The more difficult questions and problems have been designated with colored numbers. These sets of questions and problems provide students with the opportunity to enhance their understanding of the concepts covered in the chapter and to develop their analytical skills. Also, some of the questions and problems— called GO problems—have been selected for interactive solutions on the Student Companion site. The GO problems are designated with a special icon. • Genomics on the Web. Information about genomes, genes, DNA sequences, mutant organisms, polypeptide sequences, biochemical pathways and evolutionary relationships is now freely available on an assortment of web sites. Researchers routinely access this information, and we believe that students should become familiar with it. To this end, we have incorporated a set of questions at the end of each chapter that can be answered by using the National Center for Biotechnology Information (NCBI) web site, which is sponsored by the U. S. National Institutes of Health. • Appendices. Each Appendix presents technical material that is useful in genetic analysis. • Glossary. This section of the book defines important terms. Students find it useful in clarifying topics and in preparing for exams. • Answers. Answers to the odd-numbered Questions and Problems are given at the end of the text