To create a clone is to create an identical copy. This imprecise definition may be linked to a number of biological creatures and processes, including monozygotic (identical) twins (when a fertilized egg splits into two embryos during the first week of fertilization), horticulture (a section of plant implanted in a different location to create a decedent of the original plant) and parthenogenesis (the method of asexual reproduction by females.) The creatures and processes listed above all fall under the category of clones and cloning , but the difference between these and clones and it is in the cloning processes normally referenced in, for example, science fiction, that they occur. Examples cited are natural clones and cloning techniques, considered biological clones, while other types of clones and cloning occur artificially or in the laboratory. This kind of cloning is cloning in biotechnology. This cloning specifically refers to three established techniques: reproductive cloning, therapeutic cloning and genetic cloning. By observing biological and natural cloning, scientists have been able to create methods to create clones intentionally created in the laboratory. Although clones created through biotechnology are typically associated with fantasy and science fiction, the cloning of animals through biotechnology is not fiction. There are even examples of animals successfully cloned by scientists such as the lionized Dolly the Sheep. This type of technology even has the potential to clone extinct humans or animals. Even though scientists have advanced cloning technology and knowledge, whether or not this technology should be used remains controversial. Despite the controversy and... middle of article... the scientists who created Dolly starved the donor sheep's cells to ensure they were inactive. The scientists then carried out somatic cell nuclear transfer and took the inactive donor cells and fused them with a nucleus-less egg from another mutton loaf. Then, continuing to use the reproductive cloning procedure, the scientist implanted the egg into the uterus of a third breed of sheep. When Dolly came to term and was born, the scientist immediately recognized that the lamb looked very similar to the breed of ewe that had donated the DNA, and that she had nothing to do with the ewe that had given the egg or given birth to the lamb. Later, DNA testing confirmed that Dolly was indeed an exact clone of the DNA donor. On April 13, 1998, Dolly gave birth to a healthy lamb, proving that her health was standard. She would eventually have two more pregnancies and five more lambs..