The Early History of Cloning
At first,cloning was nuclear transfer which it still is today. That was at the beginning of the century. Adolph Eduard Driesch could let the eggs of a sea urchin develop into the two-Blastomere stage. He then separated them by shaking them in a flask. While doing that he also let them grow. The cells then developed into infant sea urchins. But Driesch could not explain his experiments and gave up embryology for philosophy.The first ever implantation of a nucleus into an egg took place in 1952. The scientists were Robert Briggs and Thomas King. In Philadelphia, they had transferred the nuclei of leopard frogs' eggs. Unfortunately, the egg cells did not develop. Successful nuclear transfers took place in the 1970's by Dr. John Gurdon. But the frogs did not develop any farther than tadpoles.
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