The twentieth century witnessed the emergence of genetics as a central discipline in biology. However, for much of the century, the study of genetics focused on the identification and analysis of individual genes. Only recently has another idea gained currency -- the concept that no gene acts alone, instead it is through complex molecular interactions within and among vast networks of genes and proteins that organisms ultimately live and die. Genetics: From Genes to Genomes reflects this new perspective. We integrate Mendelian genetics, molecular genetics, genomics, bioinformatics, human genetics, the unity of life forms, and molecular evolution into a cohesive comprehensive approach to the study of life in the 21st century. Students who have completed this text will have a strong command of genetics as it is practiced today by university and corporate researchers who are rapidly changing our understanding of living organisms, including ourselves; increasing our ability to prevent, treat and diagnose disease, to engineer new life forms for food and medical uses; and, ultimately, creating the ability to replace or correct detrimental genes.