Genetic engineering.ppt

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14 Δεκ 2012 (πριν από 4 χρόνια και 9 μέρες)

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Inheritance & Survival

Genetic Engineering

Genetic Engineering


Why can we not use
pig organs in
humans?


There is a shortage of
hearts and kidneys
for transplant


why
not use a pig?


Biology text book
p188

Manufacturing Insulin


Insulin is needed to
keep diabetics alive.


Human insulin works
best with humans


It is possible to obtain
small amounts of
human insulin from
dead bodies.

Manufacturing Insulin


There are insufficient
supplies of human insulin
to meet demand.


Genetic engineers have
devised ways of taking
the human insulin gene


putting that gene into
bacteria that then make
insulin.

Making insulin


The gene for insulin is
“cut” from the DNA of
a human.


This is done by using
enzymes.

Making insulin


Plasmids (small
circles of DNA) are
obtained from
bacteria.


These plasmids are
then cut open with
enzymes.

Making insulin


The human insulin
gene is “spliced” into
the bacterial plasmid.


The plasmid is re
-
introduced to the
bacteria.

Making insulin


The bacteria are
grown in large tanks
until there are millions
of them.



All the plasmids will
be busy making
“human” insulin

Making insulin


This insulin can then
be used by diabetics!

Genetically Modified Crops

GM crops

GM Crops


Read carefully
through the sheet
entitled “Genetic
Modification”

GM Crops


Make a list of the
advantages of GM
crops.



Make a list of the
reasons people
maybe be against the
use of GM crops.