It concerns about ethical aspects that arise in the field of health sciences (biology, medicine...), as well as those that arise in human relationships with each other and with other living beings. The options offered by genetic engineering are excellent to cure or relieve symptoms of certain diseases. However, the use of all these techniques is creating some moral dilemmas in the society. Usually there are no problems when the patient's somatic cells are changed to cope with the disease, but it is different if the germ cells (eggs and sperm) or an embryo are changed, because in these cases the DNA of the descendants changes as well. The problems would be bigger if genetic engineering would be used to change the physical, intellectual, artistic, or moral characteristics of an individual rather than for curing disease. Bioethics should decide what to do in each case, what the purpose is and what resources are used.