Ever since the birth of the first cloned sheep, named Dolly, the dream of human cloning has existed (Van Dijck, 1999). Cloning a mammal is described as the manipulation of an animal or human cell in order to create an identical copy of that animal’s or human’s nucleic DNA (Andrews, 1997). Though the dream of a human clone also comes with a lot of controversy regarding ethics and morals. Embryotic stem cell research, which could lead to a renewable source of human tissue, cells and eventually entire organs (Bowring, 2004), is highly controversial due to the necessity of placing a cloned embryo into a woman’s body in order to achieve that research. Politicians differentiate between therapeutic cloning and reproductive cloning as they refer to the second as “implanting a cloned embryo in a woman's womb” (Bowring, 2004), as for the embryo itself the research is not very therapeutic. Furthermore cloning by transfer of nuclei is not very effective yet as only 1% of manipulated sheep eggs reach adulthood and the number is even lower for other animals (Solter, 2000). The question whether human cloning will ever be possible and ethical remains to be answered but it seems certain that extra research in embryotic stem cells will improve techniques and success rates, which eventually brings the realization of a human clone closer one step at a time.
I ranked the five websites: “Dogs Cloned From Adult Somatic Cells”, “Human Cloning”, “Clones: A Hard Act to Follow”, “Cloning Fact Sheet” and “Dream Tech International Clones-R-Us” from 1 to 5, where 1 is most accurate and suitable website and 5 is the poorest website.
|1 |Dogs Cloned from Adult Somatic CELLS | |2 |Clones: Hard Act to Follow | |3 |Cloning Fact Sheet | |4 |Health Canada - Human Cloning | |5 |Dream Tech International Clones-R-Us |
1. “Dogs Cloned from Adult Somatic Cells”
This article describes the first successful cloning of Afghan dogs, through somatic-cell nuclear transfer (SCNT). This process has a fairly low success rate due to the difficulty of developing canine eggs (oocytes) in an artificial environment. Two dogs were successfully cloned in this experiment, which equates to a success rate of 1.6%. The genetic identity of the dogs was tested via microsatellite analysis of genomic DNA from the donor Afghan dog and resulted in a perfect DNA match of the cloned and donor dog (Lee, B.C et al., 2005). I chose this article as the most appropriate and suitable one, as it was published in a peer-reviewed science journal named Nature and contains a full reference list, as well as in text citation. Peer-reviewed articles have their information verified by researchers in the same field and therefore contain valid information. As it was the first cloned dog, independent investigators tested the DNA of the clone and published in a peer-reviewed Journal that Snuppy, the name of the dog, is identical to its Afghan donor and not his surrogate mother (Levine, 2009), which makes this article very authentic and earns it my highest rating.
2. “Clones: Hard Act to Follow”
The article “Clones: Hard Act to Follow” elaborates on the reasons behind the small success rate for the cloning of animals. It reports than only...