Cloning is a process in which another identical organism is produced by taking a DNA sample and putting it in an empty nucleus. The clones that exist now are identical twins that were formed naturally. There are two way of cloning, the Artificial Embryo Twinning and Somatic Cell Nuclear Transfer. In natural way the twins come from two-celled embryo and they grow in mother's womb, but in cloning the first cell is divided manually and the clone grows in a Petri dish.

The breakthrough in cloning was the clone of `Dolly', the first mammal to ever be cloned. Before that there were cloned smaller animals like frogs,. Dolly was made by reproductive cloning technology. It is a process called "somatic cell nuclear transfer" (SCNT). It is the transfer of genetic material from the nucleus of a donator's cell to an egg with removed nucleus. Human cloning...