To
produced a clone of an animal a sample of the DNA must be
used .Since each body cell contains a complete DNA genome,this
is easily obtained .This DNA has to be introduced into an ovum
(egg) of another animal of same species.after the ovum's
original DNA is extracted .The egg is then inserted into a
surrogate animal's womb and pregnancy proceeds as normal.Although
every body cell contains complete genome ,it will normally
activate only those genes necessary for its own body parts.-for
example kidney,brain,or bone.The other gene are not needed and are
not " switched on"however ,if the cell is starved of nutrients
,development can be stopped at an early stage,at which point
all the genes can be operative.The ovum into which DNA is
inserted will then behave as if the DNA were its own.
GENETICALLY MODIFIED FOOD.
An increasingly common practice in the food Industry is the modification of the foodstuff in order to extend their shelf life.This means that not only food, for example fruits and vegetables,but also food ingredients and additives that contain genes derived from animals ,fish ,insects, and viruses will appear in shops unlabelled as such.
GENETICALLY MODIFIED FOOD.
An increasingly common practice in the food Industry is the modification of the foodstuff in order to extend their shelf life.This means that not only food, for example fruits and vegetables,but also food ingredients and additives that contain genes derived from animals ,fish ,insects, and viruses will appear in shops unlabelled as such.
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