Concerns about gene flow and the implications for the development of monitoring protocols.

The possibility that genes win move from crop plants to wild species, as we ll as to volunteers and to neighbouring non-GM crops, are high on the list of concerns about genetic modification. This paper gives an overview of the way the concerns have been expressed by some influential groups. It then d iscusses how they might be met by monitoring regimes, and what questions ne ed to be addressed in order to construct such regimes.