题目内容
The majority of genetically modified animals are used in research to investigate changes in _____________ when specific genes are altered. This can be used to discover the function of an unknown gene, any genetic interactions that occur or where the gene is expressed.
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In ______, the AquAdvantage salmon was approved by the US FDA for commercial production, sale and consumption, making it the first genetically modified animal to be approved for human consumption.
One of the objectives for developing plants based on GM organisms is to improve crop protection. The GM crops currently on the market are mainly aimed at an increased level of crop protection through the introduction of ____________ against plant diseases caused by insects or viruses or through increased tolerance towards herbicides.
Resistance against insects is achieved by incorporating into the food plant the gene for toxin production from the bacterium Bacillus thuringiensis (Bt). This toxin is currently used as a conventional _____________ in agriculture and is safe for human consumption.
Herbicide ____________ is achieved through the introduction of a gene from a bacterium conveying resistance to some herbicides. In situations where weed pressure is high, the use of such crops has resulted in a reduction in the quantity of the herbicides used.
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