Quick Guide: Cloning
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Introduction

Embryo cloning

Reproductive cloning

Therapeutic cloning

Benefits

Concerns

Embryo cloning
Artificial twinning has been used in animal breeding for years

Embryo cloning is similar to the process that produces identical twins.

Cells are removed from a fertilised embryo and encouraged to develop into duplicate embryos with identical DNA.

This method is widely used in animal breeding and, since no embryos are destroyed and human experimentation is rare, has aroused little debate.

In contrast the two other forms of cloning - reproductive and therapeutic - are both highly controversial due to their methods and desired results.