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primary transgenic event is only rarely a potential bio-engineered
product. Most often, the particular genotype used for transformation
is not ideal for release as a product and, in addition, different
varieties may need to be developed for release in different areas.
Product development moves through various stages of breeding
and selection for both the transgene and superior agronomic qualities.
The stability of the transgenic event is assessed over generations
and the expression of the trait and its effectiveness in producing
the desired is also studied.
There is usually a requirement for field trials to test the
performance of the elite event as well as for biosafety approvals.
As the product moves further along towards release, the scale
of the trials will increase such that agronomic performance
can be assessed against current varieties. Multiple replications
are often needed to gain enough information to apply for variety
registration. Many countries have a requirement for a minimum
number of years of testing before release of any new variety – not
only bio-engineered products – to maintain the quality
of the available planting material.
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