EN
Dynamic development of natural sciences, often called the biotechnological revolution, which we observe at this very moment, leads human being to be the master of his life. Today man is able to create life in laboratories, tomorrow – by using genetic engineering – he may be able to give any shape to this artificial life. Human freedom seems to have no limits. At the other hand, that what seems to be full freedom may become the scariest prison. The intervention in genetic heritage may enslave human being, catching it in anew form, without possibilities to be back to the ‘natural’ one. In the paper the author highlights the range of the problem of human nature and its protection as the condicio sine qua non of ensuring the individual’s freedom.