Transgenic Plant
What are the various disadvantages of cross protection?

All of these
Possibility of unnecessary spread of mild virus
Possibility of mutations in inducing mild virus strain
Possibility of synergism between inducing virus and other unrelated virus

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Transgenic Plant
Expression of antisense RNA in transgenic plants is a general method used to

activate the expression of all genes in a biochemical pathway
reduce or eliminate the expression of individual genes
block the expression of virus coat protein genes
eliminate the expression of all genes in a biochemical pathway

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