Genetics

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It is much easier to clone with embryonic cells. Much later, mammals such as sheep were cloned using this process. (Nash 64)
In 1970, John Gurdon repeated the procedure suggested by Hans Spemann. This time, the experiment yielded partial success. The tadpoles were born alive, but they died when they began to feed. He showed that transplanted nuclei reverted to an embryonic state.
In the early 1980's, there was some controversy over the reported cloning of mice. Karl Illmensee and Peter Hoppe claimed that they had cloned mice from embryos. Other scientists tried to repeat their success, and they reported that mouse embryos could not be used for cloning after reaching the two-cell stage. The claims of Illmensee and Hoppe were discredited. (Specter/Kolata)
In the 1980's, biologists at Allegheny University of the Health Sciences cloned tadpoles from the red blood cells of an adult frog. The tadpoles could swim and eat just like normal tadpoles. They grew hind limbs, but died ...

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in reproductive science for years. In 1973 he produced the first calf grown from a frozen embryo. This enabled cattle breeders to improve the quality
of their herds by using surrogate mothers to breed more of the cows with the best milk and meat.
Dolly was born conceptually in a bar in 1986, when Dr. Wilmut heard a rumor that a lamb had been cloned from an already developing embryo. This rumor was indeed true; Dr. Steen M. Willadsen had produced the first mammal clone. He had attempted to clone three lambs. Two were born dead, but the
third survived.
His first success came in the forms of Megan and Morag, two clone sheep that Wilmut cloned from early embryos using ...

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