The genes of organisms can be altered using biotechnology techniques. New genes can be inserted into plants and animals to create new varieties and breeds or to lessen certain genetic activity such as susceptibility to disease. Since 1970 GM has helped produce greater numbers of crops with higher nutritional value and has been prominent in animal agriculture. Critics claim there are serious ethical, ecological, and economic issues with GM techniques. For example, GM crops can cross-pollinate with non-GM crops creating unpredictable characteristics in plants. Bioherbicides and bioinsecticides can be added to crop seeds, but are not always effective. Resistant weeds now infest 75 million acres of land across the world. Domesticated animals are being genetically modified to produce proteins that have applications for human medicine – proteins to control blood clotting or kill cancer cells, for example.
What will be the long-term impact of genetic modification of plants and animals? If plants and animals are genetically modified to resist current pathogens, will new, more resistant pathogens develop? Already, GM has led to international controversy and trade disputes, protests, and restrictive regulations on commercial products containing genetically modified organisms.
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Practice Problem 2
(It's All in the Genes)
Saturday, December 10