Ethical dilemmas raised by the use of nanotechnology in medical practice can be viewed from several perspectives: religious spiritualist perspective, the perspective of human dignity (nanotechnologies can be thought of as an affront to human dignity), the issue of controversial choice. The article aims to expose some bioethical dilemmas in using synthetic biology and nanotechnologies. Nowadays is often brought into discussion the fact it is possible to appear in the future new human species resulted not via natural selection and evolution, (...) but through the demiurgic effect of technology development in areas such as: synthetic biology, genetics, neurobiology and neurosciences, prosthesis technology and not least of artificial intelligence research. We will also refer into this paper at the possible raised challenges to ethicists who are oriented towards an ethics of species. Those challenges are raised right from the dawn of a consciousness of species, a social construction generated by changes of the meaning of belonging to humanity. During our article we argue that medical technology, especially genetics, medical assisted human reproduction and not least synthetic biology, require a rethinking ethical meanings of applying those technologies in everyday practices. (shrink)