Coverage of the pioneers of modern genetics including Mendel and his peas, Watson and Crick and the double helix, Wexler and her search for the gene that causes Huntington's disease, and contemporary scientists struggling to map and sequence all 100,000 genes in human DNA. The text addresses mRNA, Phenylalanine, etc.; the material is technical, poorly supplemented by anecdotal information, e.g., ""Was it possible that Mendel was a hypochondriac?"" That Bobby, a nine-year-old suffering from cystic fibrosis, ""likes science, hates spelling, and collects Spiderman comics,"" is too brief to add appeal and does not otherwise aid understanding. With muddy b&w photos and just-adequate drawings, this does not substitute for a standard genetics textbook.