The module is intended for scientists with a minimal background in genetics and plant molecular biology, but with a working knowledge of plant genetic resources and issues concerning their conservation and management. We hope that the module will be particularly useful to scientists in developing countries, for whom print materials may be unavailable, expensive, or too quickly outdated. We also hope that it will be useful for science educators who wish to have access to a general overview of current DNA technologies and their possible uses in biodiversity conservation and use.