Dolly became the most famous sheep in history when her birth was announced by the Roslin Institute in Scotland in 1997. Dolly was the world's first mammal to be cloned. She was born July 5, 1996, from three different mothers.
Her genetic mother provided the DNA. A second ewe provided the egg into which the DNA was injected and a third ewe carried the cloned embryo. It took 276 attempts before the experiment was successful. The birth of Dolly was hailed as a huge scientific breakthrough. Dolly became a superstar and seemed to enjoy the human attention.
Learn how Dolly was cloned=>
Dolly gave birth to six lambs. She was euthanized when she was six and a half years old after she developed a lung infection. Dolly's health problems may have been the result of the fact that she was cloned from a six year old ewe. Dolly also suffered from a form of arthritis. After her death, Dolly was stuffed and put on display in the Royal Museum of Scotland.
After Dolly was created from a cell from a mammary gland, the rest of the sample was frozen. Several years later, four clones were created from the same mammary tissue. The quads were nicknamed the "Dollies" and are exact genetic copies of Dolly. The existence of the Dollies was not made public until late 2010.