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WHAT ARE
GENETICALLY MODIFIED FOODS? Genetically
modified foods (GMF for short), also known as GMOs, are foods that have
been
altered by the addition of the genetic material of another organism.
The end
result is known as a transgenic or genetically modified food. Depending
on what
one wanted to change, one could create the ideal crop- one that is
resistant to
any sort of disease or pest, cheap and plentiful to harvest, of high
nutritional value, and resistant to perishing. Using
this technique, foods can be accurately and rapidly altered in ways no
one ever
thought possible. For example, scientists could turn a normal,
cholesterol
filled chicken egg, into a healthy, artery clogging-free egg by this
selective
breeding process. Real life examples include the development of a sweet
potato
resistant to the feathery mottle virus, that took much of the African
harvest,
and a “golden rice” crop with superior iron,
protein, and Vitamin A levels, to
fight malnutrition in Asia. This trend is quickly catching on, with
future
plans to develop a banana as a vaccine against hepatitis B. GMFs are
more
common than we actually realize. Everything from tomatoes, corn, maize,
sweet
potatoes, to soya oil all have and all continue to be produced in this
revolutionary, scientific fashion. In fact, half of North
America’s soy crop is
genetically altered. Certain medicines and vaccines and crops, like
cotton,
too, are products of genetic modification. Today,
GMFs are a multinationally accepted practice, with countries such as
the United
States, Argentina, Brazil, India and China all producing these foods.
HOW ARE GENETICALLY MODIFIED FOODS CREATED? In
the simplest terms, it involves cutting out and pasting DNA from one crop to
another, in a process called recombinant DNA. In this engineering process, the
phenotype (the basic genetic makeup) of an organism, the genome, which could be
an animal, plant, or even bacteria, is enhanced by the addition of the genes of
a living organism or other component (ie: an enzyme) to make a certain product.
Acting much like pair of scissors, restriction enzymes
first cut off the DNA sequence at a specific spot, called a plasmid, from the
biological source. These plasmids are fragments of DNA in bacteria that will
transfer chromosomes from one site to the other. This plasmid is inserted into the target cell, where it will be
glued together with ligase, an enzyme. After this, it will “express the gene,”
meaning that under the right conditions, it should reproduce quickly and
efficiently. This technology is used frequently to produce antibiotics, cures
for sickle cell anemia and even insulin, which would normally only be produced
in the body. These genetically modified crops can
receive DNA from both non-plant and plant sources. |
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