The teachers identity and functions is not so questioned lo spite of the role that isaccomplished in any educational action. This research is about the Biology teacher’sbeliefs in aspects that affect his/her practice. These aspects are pedagogic, didactic,conceptions about biologic knowledge, and teachers learning. There is an evidence thatshows lo the teachers a tendency to assume an imitation modelling role as aconsecuence, it is intuitive and non critic.