Nature & Environment
Cloning
...Scotland reasoned that the egg and the donated nucleus might need to be at the same stage in the cell cycle. In 1995 he and reproductive biologist, Ian Wilmut, succeeded in cloning farm animals from advanced embryos. They then went on to clone an adult mammal for the first time, producing a lamb named "Dolly" from a six-year-old ewe, using tissue taken from the ewe’s...