This book describes a simple and reliable technique which can be used to demonstrate the whole range of chromosome activities in a variety of plant and animal materials. It balances the theoretical and practical aspects of the subject so that practical observations can be interpreted in the context of cytogenetical theory. The information is presented in a way which assumes no previous knowledge, and then takes readers systematically through the subject to the point where they can carry out independent investigations into any part of the whole cycle of chromosome activities.--