题目内容
Palmer amaranth is a weed that competes with cotton. A native of the southwestern US, it traveled east and was first found resistant to glyphosate in 2006, less than ____ years after GM cotton was introduced.
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The first genetically modified food approved for release was the Flavr Savr tomato in ______, which was developed by Calgene. It was engineered to have a longer shelf life by inserting an antisense gene that delayed ripening.
With the creation of golden rice in _______, scientists had genetically modified food to increase its nutrient value for the first time.
_________wasthefirstcountrytocommercializeatransgeniccropin1993withtheintroductionofvirus-resistanttobacco.
In1995,Bacillusthuringiensis(Bt)Potatowasapprovedforcultivation,makingitthefirstpesticideproducingcroptobeapprovedin_________.
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