the scottish scientist took a very small piece from the udder of an adult sheep (sheep 1) .From that small poece he removed the nucleus, and then he transferred the nucleus into the egg cell of another ( female ) sheep ( sheep 2 ) but first he removed from that egg cell all the material that would have determined sheeep 2 characteristic in a lamb produced from that egg cell . Ian Wilmut implanted the manipulated egg cell of sheep 2 into yet anotger (female) sheep ( sheep 3 ) . Sheep 3 became pregnant and had a lamb :Dolly...which sheep is Dollu identical to?.. sheep1 2 or 3 ?
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Researchers for the first time have cloned an adult mammal, a controversial feat that could presage the ability to clone human beings.
The startling achievement, long thought to be biologically impossible, was accomplished with sheep, the first of which, named Dolly, was born in July in Edinburgh, Scotland.
A total of nine cloned lambs have been born so far using the new technique, each an identical genetic "twin" of the parent from which it was cloned. In theory, the same technique could be used to make unlimited copies of any single adult animal, the researchers said.
The Scottish scientists who conducted the work said their goal was not to clone humans, but to create large herds of specially engineered farm animals -- including some that would produce human medicines in their milk and others that would contain "humanized" organs suitable for transplantation into people.