Humans have been modifying their food for thousands of years. Until the 20th century, this had to be done by breeding desirable characteristics into crops. This method requires plenty of effort and is rather imprecise. Genetic modification speeds up the process by identifying the genes that produce these selected traits and introducing them ... ions in salt are toxic to plants because they interfere with their metabolism. The modified tomato contains a gene that makes it gather ions inside vacuoles where they can't harm the plant. This ensures that it will look, feel and taste the same as a...

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• Grade Level: High School