oughs" defines cloning as, "copying genes and other pieces of chromosomes to generate enough identical material for further study" . Two other types of cloning produce complete, genetically identical animals. Blastomere separation (sometimes called "twinning" after the naturally occurring process that creates identical twins) involves splitting a developing embryo soon after fertilization of the egg by a sperm to give rise to two or more embryos. The resulting organisms are identical twins (clones) containing DNA from both the mother and the father. Dolly the sheep, on the other hand, is the result of another type of cloning that produces an animal carrying the DNA of only one parent. Using somatic cell nuclear transfer, scientists transferred genetic material from the nucleus of an adult sheep's udder cell to an egg whose nucleus, and thus its genetic material, had been removed.
             Although cloning technology issues have only been publicized greatly since 1997 cloning ideas have been around since as early as 1938. "Medical Research: The Path to Adult Cloning" reports in 1938 scientist Hans Spemann of Germany theorized that organisms could be reproduced by transplanting the nucleus of one animal's cell into the egg of another's. The nucleus of a cell contained a genetic blueprint for the constitution of an organism. One of the first experiments in cloning took place in 1952. Based on Spemann's theory, U.S. Scientist Robert Briggs and T.J. King infused the nucleus of a frog embryo's cell into a frog egg. The experiment failed a frog did not develop from the egg. ("Medical").
             Cloning of human and non-human species is ethical. Ethical implications involved in human cloning are only temporary. This can be shown in the development of In Vitro Fertilization (IVF). According to Hansen in "Embryonic stem cell production through therapeutic cloning has fewer ethical problems than st...