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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 dread_knight on June 1, 2005
Category: Science
Words: 2730 | Pages: 11
Views: 184
Popularity Rank: 66,439
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Introduction
The possibility of human cloning, raised when Scottish scientists at Roslin Institute created the much-celebrated sheep "Dolly" (Nature 385, 810-13, 1997), aroused worldwide interest and concern because of its scientific and ethical implications. The feat, cited by Science magazine as the breakthrough of 1997, also generated uncertainty over the meaning of "cloning" --an umbrella term traditionally used by scientists to describe different processes for duplicating biological material.
What is cloning? Are there different types of cloning?
When the media report on cloning in the news, they are usually talking about only one type called reproductive cloning. There are different types of cloning however, and cloning technologies can be used for other purposes besides producing the genetic twin of another organism. A basic understanding of the different types of cloning is key to taking an informed stance on current public policy issues and making the best possible personal decisions. The following three types of cloning technologies will be discussed: (1) recombinant DNA technology or DNA cloning, (2) reproductive cloning, and (3) therapeutic cloning.
Recombinant DNA Technology or DNA Cloning
The terms "recombinant DNA technology," "DNA cloning," "molecular cloning,"or "gene cloning" all refer to the same process: the transfer of a DNA fragment of interest from one organism to a self-replicating genetic element such as a bacterial plasmid. The DNA of interest can then be propagated in a foreign host cell. This technology has been around since the 1970s, and it has become a common practice in molecular biology labs today.
Scientists studying a particular gene often use bacterial plasmids to generate multiple copies of the same gene. Plasmids are self-replicating extra-chromosomal circular DNA molecules, distinct from the normal bacterial genome (see image to the right). Plasmids and other types of...
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