Transgenic Plant
The controversy regarding the use of Bt corn is that it

can contaminate groundwater
is a potential allergen to humans
is potentially harmful to monarch butterflies
both (a) and (b)

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Transgenic Plant
Antisense technology

combines genetic material from different species
selectively blocks expression of a gene
alters or transfers cells
combines organelles and cells

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Transgenic Plant
Cross protection against viruses in transgenic plants can be obtained by

any of the above
inoculating the susceptible strain of a crop with a mild strain of a virus that helps in developing resistance against more virulent strain
inoculating the susceptible strain with genes of nucleocapsid
inoculating the susceptible strain with the coat proteins of virulent strain

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