Gr 5-8-The history of genetics is introduced, beginning with Gregor Mendel's studies of pea-plant cross-pollination. The book skillfully explains the discovery of DNA and the emergence of modern biotechnology, including how DNA is replicated, how genes are expressed and translated as cell proteins, and how the human genome is being mapped. Thirty color photos, informational sidebars, and detailed diagrams complement the text. However, the author does not delve into the more controversial questions raised by genetic research and does not sufficiently discuss current developments and trends. Tony Allan's Understanding DNA: A Breakthrough in Medicine (Heinemann Library, 2002), is a suitable title for this age group and can be used in combination with this text to begin exploring ethical issues.-Carolina Geck, Kean University, Union, NJ Copyright 2005 Reed Business Information.