Modifications that lead to undesirable side effects can be discontinued. Breeding involves the mixing of two complete genomes. The risks of unusual or undesirable effects are greater in classical breeding, because so many more genes and potential combinations of genes are involved. GM work involves only one or a few genes. They permit more accurate, more selective and more specific changes.
Successful crosses involve many animals and several generation times.
GM induced changes are also faster, involving fewer generation times than classical breeding techniques. GM is actually an ancient evolutionary process. Our prokaryote ancestors were transferring genes long before humans arrived on the scene. There are actually no documented cases as yet of GM products causing harm. Compare the potential risks of genetic modification to that of added hormones, antibiotics, or to the use of pesticides, fertiliser, packaging, People need to be educated.