In a clear visual way Biology at a Glance presents all the biology material needed for the new GCSE Double Science syllabus for first examination in 2008. It also includes most of the extra content required by the separate Biology and Human Biology GCSE courses. It is a useful introductory guide to AS level Biology, and a handy reference and planner for teachers. The third edition contains expanded information on genetics including gene therapy and genetic counselling. There is also expanded information on observed natural selection, biological control and the use of glasshouses for commercial growing. Each subject is presented diagrammatically on a single page making it easy to learn the key facts and commit them to memory. The book is illustrated throughout in full colour and contains labelled diagrams, photos and flow charts to enhance understanding and clarity. There are questions on every topic and a glossary of words to remember.