Wait. Do you think cloning humans isn't possible?
If you have an identical twin you already have a natural clone. I'm not sure what you are getting at. Are you suggesting Dolly is not really a clone?
Here are a couple of simple "lay" articles on human cloning. If you want scientific papers about cloning and what may or may not be possible, I suppose those could be provided to you as well. The article below makes the prediction that we will see a human clone on the evening news within ten years. Whether it's 10 years or 20 years or more really doesn't matter. If you don't think it's possible to clone humans, I wonder why you think it wouldn't be possible.
http://www.howstuffworks.com/human-cloning1.htm
http://en.wikipedia.org/wiki/Panos_Zavos
http://www.zavos.org/index.html
"In January 2001, a small consortium of scientists led by Panayiotis Zavos, a former University of Kentucky professor, and Italian researcher Severino Antinori said that they planned to clone a human in the next two years. At about the same time, the New York Post reported a story about an American couple who planned to pay $500,000 to Las Vegas-based Clonaid for a clone of their deceased infant daughter.
These scientists may be chasing glory in the name of science. Whatever their motivation, it's likely that we will see the first cloned human baby appear on the evening news in the next decade. Scientists have shown that current cloning techniques work on animals, but only rarely do they succeed in creating a cloned embryo that makes it through birth.
If human cloning proceeds, one method scientists can use is somatic cell nuclear transfer, which is the same procedure that was used to create Dolly the sheep. Somatic cell nuclear transfer begins when doctors take the egg from a donor and remove the nucleus of the egg, creating an enucleated egg. A cell, which contains DNA, is then taken from the person who is being cloned. The enucleated egg is then fused together with the cloning subject's cell using electricity. This creates an embryo, which is implanted into a surrogate mother through in vitro fertilization. If the procedure is successful, then the surrogate mother will give birth to a baby that is a clone of the cloning subject at the end of a normal gestation period. Of course, the success rate is only about one or two out of 100 embryos. It took 277 attempts to create Dolly.
http://www.zavos.org/library/RBM_simpson.htm
Toward scientific discussion of human reproductive cloning
Joe Leigh Simpson
Baylor College of Medicine, Houston, Texas, USA
Correspondence: e-mail:
[email protected]
Science advances in time honoured ways. First, an investigator generates a hypothesis and then proposes experiments. Concurrently, ethics of the proposed research must also be considered, based on principles of beneficence. Do benefits outweigh risks, for society as well as for individuals? Will the research be conducted under the aegis of the appropriate oversight, Institutional Review Boards in the United States? Next follows the actual study, its publication and eventual validation through replication. Ideally, scientists, individuals, and society synchronize these time-honoured sequences. However, in reproductive medicine we are often accused of deviating. Promising clinical advances are said to be incorporated into practice without prior ethical deliberation. Conversely, others in society would, strictly on ethical grounds, proscribe many advances beneficial to patients. A considerable minority still disagrees with women exercising any reproductive choices, undergoing prenatal genetic diagnosis or availing themselves of assisted reproduction treatment. Many would seem quite happy to turn the reproductive clock back half a century.
The predictable effect of attempting to ban or criminalize reproductive cloning is to drive investigators underground, and cause patients to become complicit. Paradoxically, the result is to hide the science, rather than have it conducted under a spotlight that would generate public confidence. Zavos (2003) note could have the salutary effect of helping lead us out of this scientific imbroglio. ...
http://imgen.bcm.tmc.edu/molgen/facultyaz/simpson.html
Joe Leigh Simpson, M.D.
Professor, Departments of Obstetrics & Gynecology and Molecular and Human Genetics
M.D., Duke University School of Medicine, 1968
Intern in Pediatrics, The New York Hospital, 1969
Resident in Obstetrics and Gynecology, The New York Hospital, 1973
Fellow in Obstetrics and Gynecology, Cornell University Medical College, 1973