... adult differentiated cells cannot be used to clone an organism."" (http://library.thinkquest.org/C0122429/history/1952.htm). In 1962, John Gurdon claimed to have cloned frogs from adult cells. His experiment demonstrated that cells retain the ability to form different tissues even after they specialize. Yet, mistakes were found in his work. "Dennis Smith pointed out that there were some undifferentiated ... sex cells in the intestines of South African frogs, so the tadpoles Gurdon cloned may very well be cloned from those undifferentiated cells."" (http://library.thinkquest.org/C0122429...

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• Grade Level: High School

... there are eight million human clones living on earth. Identical twins have the same genetic information due to the embryo splitting during early development producing two organisms, therefore making them clones. Cloning has a short but rather amazing history. People actually attempted cloning at the beginning of the 20th century. Sea urchins, frogs, sheep and other organisms were used to try to perfect cloning. Cloning ... has been attempted many times. The first attempt was made by Adolf Eduard Driesch. Driesch could let the eggs of a sea urchin into a two-blastomere stage. Then he sepa...

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• Grade Level: High School

... development? Assuming all of this, a baby that was cloned would be the age of its donating parent, a true medical problem. At the present time, the cloning of humans has been banned in the United States and various other countries. The possibility of mutations is one of the reasons for this action. In early experiments on frogs, mutations occurred. Are we willing to risk one mutation in human ... might have a diminished sense of individuality. A clone might have fewer rights than other people. Doctors might use clones as sources of organs for organ transplants. Cloning is at odds with t...

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• Grade Level: High School

... development). In Dolly's case the cell was fused with another sheep's egg. The result fused together and grew into an embryo, which then could be placed in a surrogate mother (Milgram 123). Because the embryos genes came from the nucleus of another being the result will be a clone. Many scientists over many years have attempted to clone some organism, whether it be frogs, sheep, or mice. Robert ... Briggs and Thomas King made early attempts in 1952. They used the method of nuclear transplantation to clone a frog and ... the result was several tadpoles ("Early" 1). Until 1996 scientists...

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... frog cell, and then allow the egg to develop into a tadpole. This "Nuclear transfer" transplants an animal gene into an egg. The tadpole is therefore a clone of the embryo that donates its nucleus. In 1975 scientists got tadpoles after transferring cell nuclei from adult frogs. Over a decade later, in ... 1986, a sheep was cloned by nuclear transfer of embryonic cells. Dolly, the first cloned sheep was introduced to the world. In 1998 more than 50 mice were reported cloned from a single ... for clinical trials in patients with irreversible brain and spinal damage. Reproductive cloning ...

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... and brings it to life through the process of cloning. In 1938 a German scientist Hans Spemann proposes a "fantastical experiment" to transfer one cell's nucleus into an egg without a nucleus, the basic method that would eventually be used in cloning. Fourteen years later in 1952 Briggs and King clone tadpoles. Another scientist John Gurdon clones frogs from differentiated cells in 1962. In ... 1969 Shapiero and Beckwith isolate the first gene. By 1973 Cohen and Boyer create first recombinant DNA organisms. 1978 ... , the release of David Rorvik's book, In His Image: The Cloning of a man...

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• Has Bibliography

... of a clone as a later born identical twin. They will be indistinguishable in biology from any other human being. Many people believe that clones will be used as spare parts for the rich in need of a liver or some other organ. There are also beliefs that these clones will be headless as well as be killed without committing murder. In reality using ... way, there is a new method of reproduction called cloning. There are two methods of cloning. The first, called embryo cloning, has been achieved years before in frogs, other amphibians, mammals, and once it was tried with humans, however bo...

• Word Count: 1536
• Approx Pages: 6
• Grade Level: High School