The books in the A True Book: Greatest Discoveries and Discoverers series feature discoveries within specific disciplines. Each volume includes an introduction to the field and its historical background, discoveries from recent decades, and possible future directions, as suggested by current research and technological developments. In addition to crediting the work of Charles Darwin, Gregor Mendel, James Watson, and Frances Crick, Genetics acknowledges the contributions of Rosalind Franklin and Henrietta Lacks. The book briefly discusses controversies over issues such as cloning and genetically modified foods. Wide-spaced lines, large type, and many color photos give the pages an accessible look, even for readers who find the vocabulary challenging at times. As can be expected from the long-running, reliable True Books line, this series offers historical perspective and up-to-date information in a familiar format.