Expectations play a major role in ‘driving’ biotechnology research and development. However, their ethical significance has been largely overlooked. This article examines the dynamics and ethics of expectations surrounding biotechnologies, focusing on biobanks and the promise of personalised medicines. It explores the personal and social implications of expectations, especially where technologies fail to eventuate. The article identifies the claims and practices that support the expectations pertaining to biotechnologies and some of the factors that work against the fulfilment of predicted innovations. (...) It is argued that the role of expectations in shaping thinking and action needs to be taken seriously by those who are concerned about the ethical implications of biotechnologies. (shrink)