This procedure has drawn significant controversy around the world. Cloning is done through a process of nuclear transfer. The donor, and the recipient are then fused together. The product of this fusion starts to develop like a normal embryo. Dolly may have been the first, but since that cloning other animals, such as, cattle and mice have been successfully cloned.
Cloning presents many issues to consider.
The ability of scientists to produce clones or offspring from cultured cells makes it possible to genetically modify animal cells. This process may be beneficial to humans. The cells used as a donor result in the offspring sharing the same DNA code. For example, in an experiment with sheep, scientists have incorporated the gene for human factor IX, which is necessary in blood clotting. The first sheep born with this factor secrete the human protein in their milk.