HISTORY OF CLONING

摘要

Artificial cloning of animals is one of the leading achievements of 20th-century biology, providing the means to create an organism that is an exact genetic copy of another - an identical twin. It is a far more complex business than the long-established techniques of cloning plants by taking a cutting such as a twig or stem and letting it take root - the origin of the term "clone", from the Greek for twig.