Click on the images below to find out more about these milestones
1938
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Hans Spemann, a German scientist, first speculates about the principle behind cloning |
1952
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Robert Briggs and Thomas J. King, American embryologists, complete the first successful SCNT using frog cells and eggs |
1962
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John Gurdon, Oxford University zoologist, conducts the first successful cloning experiment using adult frog cells |
1996
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Ian Wilmut, English scientist, clones the first mammal using adult stem cells – Dolly the sheep is introduced to the world |
1998
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For the first time, scientists isolate human embryonic stem cells |
2001
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The House of Representatives passes legislation banning human cloning, but the measure doesn’t pass the Senate because some want to allow therapeutic cloning |
2004
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Scientists in South Korea use cloning to create human embryos and use their stem cells for therapeutic research |
2005
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South Korea clones a dog, which is an important achievement because the reproductive systems of dogs are complex |
