Create your own at Storyboard That History Types of Cloning Steps of Cloning Already Cloned Orgaisms Issues Around Cloning Disadvantages & Advantages 1938- Hans Spemann came up with the idea of cloning. 1952- Robert Briggs and Thomas King tried to clone a frog and were not successful 1970- John Gurdon successfully cloned a frog but it only got to a tadpole Ian Wilmut and Keith Campbell successfully cloned 2 sheep. 1998- First cloned mouse 2003- A deer, rat, rabbit, horse and mule were all cloned There is two types of cloning reproductive cloning and therapeutic cloning. Reproduction cloning is the way animals are cloned. A skin cell is removed from the animal and is transferred into a egg cell that has its own DNA but the nucleus is removed.The the cell is stimulated by an electric current. And from there the egg develops. Therapeutic cloning is to study human development and to treat diseases by harvesting stem cells.this type of cloning is also used to clone body parts to replace damaged cells. Reproductive Cloning Some scientist think cloning is good because it can be used to eradicate certain diseases. Some scientist think it is bad because if you would drink milk of a cloned animal or eat them you could get a disease. Advantages •It can help infertile couples to have children •Organ replacement •Can have desired characteristics •Speed up breeding of slow animals •Medical research would be expanded Disadvantages •Can bring new diseases •Less opportunity to create new varieties of animals •Low success rates •Devaluing human lives •Religion and cultural beliefs Japanese scientists have already cloned 8 calves from one cow but only 4 survived. Scientists have also cloned animals like rats, deer, dogs, horses and mules. Full humans have not been cloned but body parts of humans have been cloned.