The lamb was the first mammal successfully cloned from an adult cell.
Cells were taken from the udder of a six year old ewe they were later cultured and implanted into surrogate ewes.
Dolly's birth was not announced until February of 1997, and the controversy began.
Some saw possible medical benefits from cloning, whilst others saw it as dangerous and unethical.
At the age of six, Dolly died, from a progressive lung disease, bringing up questions of genetic abnormalities caused by cloning.
During her life Dolly was mated to a ram with whom she eventually had four lambs, all of whom have had normal lives, for sheep.
After her death, Dolly was stuffed and put on display at the National Museum of Scotland, in Edinburgh.
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