Jumping genes?

Andy Law Andy.Law at bbsrc.ac.uk
Mon Sep 21 03:32:21 EST 1998

The alternative solution is that the weed already had a gene that either
was or was close to being a herbicide resistance gene. As one correspondent
already pointed out, herbicide application is a potent selective pressure.
The individuals within the weed population with the most effective
endogenous herbicide resistance would be the survivors in that environment.

You only need to invoke "jumping genes" theories if you have conclusively
demonstrated that the DNA sequence responsible for the phenotype you are
observing in the weed species (herbicide resistance) is precisely the same
one that you introduced into the non-weed species. Simnilar phenotype is
not proof of similar mechanism.

Andy Law
( Andy.Law at bbsrc.ac.uk )
( Big Nose in Edinburgh )

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