Cloning

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Term Paper Title	Cloning
# of Words	2464
# of Pages (250 words per page double spaced)	9.86

Cloning

[Category]:

Science

[Paper Title]:

Cloning

[Text]:

Cloning, the process of “Manipulating a cell from an animal so that it
grows into an exact duplicate of that animal is the forbidden fruit of biology.”
(Begley 54). The word “clone”, derived from the Greek word “Klon”,
meaning twig or slip, refers to asexual reproduction. Also known as vegetative
reproduction. Cloning became known to the public about 30 years ago. This idea
of cloning about his time resulted in an experiment of the successful asexual
reproduction. This experiment took place in England, where a whole bunch of
tadpoles was cloned by the technique of nuclear transplantation. Nuclear
transplantation refers to the process of moving a nucleus from one cell to
another. (Mckinnel 28) The person responsible for this introduction of cloning
was Joshua Lederberg, a noble laureate geneticist. (Kass, Winters 9)

Scientists have known for a long time what it took to clone, and many had
found themselves believing that it was biologically impossible. One problem was
the way the embryo develops. Every cell in the body comes from the same
fertilized egg therefore, every cell in the body contains the same genes. But
animal and human cells are specialized and different, so that a heart cell acts
as a heart cell and a liver cell acts as a liver cell. This specialization
starts when the fetus is formed, and once a cell reaches its final state, it
never changes. A brain cell will always be a brain cell as long as a person is
living, it would never change into a liver cell although it contains the same
genes. (Kolata 24)

Frogs were the first multicellular animals to be cloned in the 1950’s. A
thorough cloning experiment produces a frog asexually. No gamete nucleus, sperm
or egg, participates in the development of a frog that is truly a clone. (Mckinnel
3) The cloning procedure in frogs, toads, and salamanders is very difficult. In
order to start this cloning process, the ability to obtain eggs and sperm from
frogs had to be introduced. Also the process of vitro fertilization, removal of
maternal chromosomes from eggs, and the splitting of embryos into individual
cells. (140) To obtain frog eggs, the eggs have to grow to their maximum size
and the frogs are ready for hibernation under the ice of lakes and streams.
Ovulation can be induced from September to or past the time of natural
ovulation. Eggs leave the ovary, move to the reproductive tubes, and become
available to the embryologist when the ...

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