The paper defends that study of human biological body is basically a technical question in that it is conceived according Cartesian paradigm as res extensa, since it is a biological-physiological structure. As such, having in mind that objective of scientific praxis is restore health to the sick body, biotechnological research, founded in the investigation and modification of human genetic structure, has a specificity and a proper area of action that are not reduce themselves necessarily to moral dilemmas; therefore, must be separated moral problems and technical activities, regarding the object of biotechnology and its action. The paper doesnâ€™t deny the approximation between technical and moral nor derails a moral reflexion about scienceâ€™s methods and results. It affirms that ethical considerations must focus on scienceâ€™s results, not a priori on scientific practice, because it perceives differences between technical questions (studied by science) and moral questions (studied by philosophy and other disciplines). So, biotechnology, that cannot be confused with eugenics or biopolitics, and that is the new stage of modern medicine, conquest a special place on search of cure of diseases that have not cure until now.