Biotech revolution

kissimmeemisologistΒιοτεχνολογία

14 Δεκ 2012 (πριν από 4 χρόνια και 10 μήνες)

147 εμφανίσεις

Biotech revolution

Ch 9 and D 45 Explain how
technological advances have affected
the size and growth rate of human
populations throughout history

What advantages does genetic engineering
have over selective breeding?


Genetic engineering


any technique to
identify or change genes at a molecular level


Selective breeding
-

artificial breeding or
planned breeding to produce desired traits


Changes from genetic
engineering are more precise and
appear more quickly

What might be a negative result of growing a
crop that is genetically engineered to resist
weed killer?


In the first year there will be limited
negative impact on the crop (consider
environment). In the second year, a
different crop may/should be planted in
the same space. If leftover seeds from
year one’s crop do germinate, the weed
killer will not destroy the now unwanted
crop.

A genetically engineered medicine for heart attack patients
tPA
,
is being used on some stroke victims. A stroke is caused by a
blood clot in the brain. Why might
tPA

effectively treat strokes?


The
tPA

could break up (dissolve)
brain clots in the same way it
breaks up clots in the coronary
(heart)
artieries
. See also “off
label” uses from a medical and
legal point of view.

How have antibiotics and vaccines affected death rates? How might
further applications of genetic engineering to cancer and heart disease
treatments change death rates in the future?


Antibiotics (agent against bacterial illness) and
vaccines (agent against viral illness) have
decreased death by infectious diseases.


Genetic engineering could create technologies
that could decrease death from non
-
infectious
disease such as cancers and heart disease by
identifying and changing genes believed to
cause these diseases.

“Looks like we grafted a few too many
human genes into the kohlrabi.”


Grafted


to join


Kohlrabi


a vegetable in the mustard plant
family


The joke is that humans and plants do not
have enough similar genes (genomes) to
create
transgeneric

(cross species)
hybrids(mixes).
Scientists
cannot create
“human plants”