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Techniques of Cloning


? It is now possible to make clones, or exact genetic copies, of sheep, cows, goats, mice and, probably, humans. This opens the way towards the production of replacement body parts from adult cells ? ( Gurdon and Colman 743 ).

Cloning techniques have been in use for centuries. The practice of taking cuttings is universal among gardeners, and large companies now propagate desirable plant strains in their millions. Lower invertebrates can also be cloned. For example, cut an earthworm or flatworm in half, and the missing halves will regenerate to create two genetically identical individuals. Although vertebrates cannot be cloned by these routes, identical twins are naturally occurring genetic clones. Moreover, the method of nuclear transplantation, first developed about forty years ago in frogs, has been successfully used to make clones of sheep, mice, cows and goats, and it could probably be applied to people too. By taking a few non-reproductive cells from adult mammals, identical replicas can be created without damage or even inconvenie... [to view the full essay now, purchase below]

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