Tampering with the genes of living organisms and the creation of large-scale mutant in laboratory encounters primarily on ethical questions. People are afraid to eat genetically modified food, because while it is undoubtedly better than the traditional, not as yet its impact on the human body, and the negative impact would occur only after many years. Techniques of genetic engineering can also be used for cloning. It is a process which extracts identical genetic copy of the organism. For the first time the cloning in 1996, the famous sheep Dolly. To this day, many animals have already been created with the transfer of chromosomes from a somatic cell into an egg donor surrogate mother, thus bypassing the process of sexual reproduction. While the use of cloning for research or in activities aimed at the preservation of rare species is still acceptable, for example, the cloning of a favorite cat for fun, or worse, human cloning is highly unethical. Another threat stemming from the use of genetic engineering techniques is the possibility of their use by terrorists
breeding of plant and animal organisms in their cells with foreign DNA transferred from another species.