This book emphasizes the experimental data and results that support the concepts of molecular biology: DNA transcription, translation, replication and repair. Experimental methods are extensively covered. The text presumes a prior course in general genetics. The text has been updated throughout to reflect the most current ideas, tools, mechanisms and data used to interpret genetic processes and there is new material on genomics and DNA damage and repair. With this new edition, all line art (which is in full colour), tables and many photographs are available as jpeg files on the Visual Resource Library CD-ROM and text-specific website.