This module will describe the basis of heredity, describing both the functions and the structures of genes and whole genomes. Examples will be taken from bacterial, animal and plant systems and will be considered from both functional and molecular points of view. The influence of the "new genetics" on medicine, agriculture and society will also be covered. Practical work will involve a molecular genetic analysis of a symbiotic, nitrogen-fixing bacterium and a molecular mapping exercise of traits that confer disease resistance in plants. It is strongly recommended that students taking this module should also take BIO-2B02 (Molecular Biology).