p5 e-learning science genetically modified food
TRANSCRIPT
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Genetically Modified/ Engineered Food.
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What are GM crops?
• Plants which have been genetically altered to express a desirable trait (Perry 2003)
• Herbicide resistance• Virus resistance• Insecticides• Environmental Tolerance • Increased nutritional value
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Natural genetic evolution of the maize crop took 10,000 years.
From Teosinte (top) to corn or maize (bottom)
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Genetic modification can shorten this process to a few years.
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Plant Breeding and Crop Yield
Wheat in Mexico1950 1960 1970 1980
0
4
3
2
1
Tons per hectare
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Peas (on the left) that make a genetically engineered bean protein are insect-resistant and do not need to be sprayed with pesticides.
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What are people’s concerns• Is this food safe? • Should food be
labeled?• Are there adverse
environmental effects?
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What about their nutritional value and safety?
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References
• http://tiki.oneworld.net/food• http://www.brighthub.com/science/genetics/
articles/23358.aspx