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History Of Cloning

History Of Cloning

The History of Cloning
The theory of being able to make a genetic copy (a clone) of another animal has been
around for quite a while. In this section as the title reads I will show the history of cloning.

400 million years B. C.- Plants have been cloning themselves since not to long (as far as
the Earth is concerned) after their introduction to our planet. They send out runners that
create an identical copy of the parent plant.

1938- Hans Spermann, of Germany, envisions what he calls the "fantastical experiment".
He suggests taking the nucleus from a cell in the late-stage embryo and transplanting that
nucleus into an egg.

1952- Scientists Robert Briggs and T.J. King use a pipette to suck the nucleus from the
cell of an advanced frog embryo, they then add it to a frog egg. The egg didn't develop.

1970- John Gurdon tries the same experiment with the same procedure. The eggs
developed into tadpoles but died after they were ready to begin feeding. He later showed
that transplanted nuclei revert to an embryonic state.

1973- Ian Wilmut just finishes his doctorate at Cambridge University when he produces
the first calf born from a frozen embryo. Cows only give birth to five to ten calves in a
lifetime. By

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