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Cloning. Cloning Cloning is the process of creating a genetic duplicate of an
individual. ... Imagine a world in which cloning is permitted and practiced. ...
The Mystery of Cloning. Cloning Cloning humans is banned in 23 countries. ... Other
advocates of human cloning believe that cloning involves risks of abnormalities. ...
Human Cloning. Human Cloning Human cloning is one of the most talked about issues
of today. ... In 1903 cloning was introduced, by cloning plants. ...
cloning. ... The beginning of cloning started from the structure known as DNA. DNA is
the heredity function of beginning humans and all living organisms. ...
The Two Faces of Human Cloning. The Two Faces ... of cloning humans. President Bush
strongly supports legislation banning all human cloning. ...
Submitted by strikeforce99 on February 2, 2006
Category: English
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What is Cloning - Is it Right or Wrong?
On July 5, 1996, a sheep named Dolly was born in the Roslin Institute in Edinburgh, Scotland. Dolly was the first clone of a mammal from an adult cell. Dolly was not, however the world's first attempt at cloning, which began at the beginning of the century. (10) The birth of Dolly also introduced the birth of the possibility of another idea: the cloning of human beings This gave rise to controversy and the question of whether cloning humans was morally right.
There are two different methods or ways to clone. One way is known as embryo cloning, which is also known as 'artificial twinning' because it resembles the process in which twins develop. "Human embryo cloning starts with a standard in vitro fertilization procedure. Sperm and an egg cell are mixed together on a glass dish. After conception, the zygote (fertilized egg) is allowed to develop into a blastula (a hollow mass of cells). The zygote divides first into two cells, then four, then eight... A chemical is added to the dish to remove the "zona pellucida" covering. This material provides nutrients to the cells to promote cell division. With the covering removed, the blastula is divided into individual cells which are deposited on individual dishes. They are then coated with an artificial zona pellucida and allowed to divide and develop. The experiment by Sillman et al. showed that the best results could be obtained by interrupting the zygote at the two cell stage. Many of these pairs of zygotes were able to develop to the 32 cell stage, but no further. They might well have had the potential to develop further and even mature into a viable fetus, except that the original ovum was defective and would have died anyway." (4)
The other form of cloning is known as Adult DNA cloning which was what was done in the case of Dolly. "...a cell was taken from mammary tissue of a mature 6 year old sheep while its DNA was in a dormant state. It was...
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