This thesis reviews some broad issues of science teaching in order to place genetics within a science framework. Problems specifically pertinent to a genetics curriculum are then focussed upon. Three major areas of research in science learning are discussed. These are meaningful learning, concept mapping and problem solving. Meaningful learning is not just 'getting the right answer', but occurs when new concepts are linked to existing ones. Many researchers therefore stress the usefulness of concept mapping as a tool to encourage meaningful learning. Problem solving is a special case of meaningful learning and is also recognised as a skill applicable to novel situations. Recent literature indicates that teachers benefit from knowing which genetic concepts students perceive as difficult. Students in both Australia and Britain were surveyed and thirty statements were then placed in rank order of difficulty. These results supported previous research and confirmed the need to view a topic from the learner's point of view rather than just the teacher's standpoint.