Genetic engineering f examples 1 bollgard and

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I. Genetic Engineering F. Examples 1. Bollgard ® and Bollgard II ® Cotton Both strains express insecticidal protein isolated from Bacillus thuringiensis (Bt) Safe – Farmers can spray with Bt toxin and still label produce as organic Low toxicity to most non-target organism types Low persistence – breaks down readily Bollgard II ® has stacked traits to enhance effectiveness Controls bollworms, budworm Year 2000 – United States averages Cotton fields planted with Bollgard ® sprayed 3.9 times less often vs. conventional fields Reduced total pesticide use by 2.7 million pounds Pest control cost less - $15.43/acre Higher production - 37 pounds/acre I. Higher profit - $39.86/acre Concern – Development of resistance by insect pests
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I. Genetic Engineering F. Examples 2. Golden Rice GM rice containing genes that produce beta-carotene Can be converted to vitamin A Vitamin A deficiency (VAD) may cause weakened immune systems, partial to total blindness, and increased chance of death VAD causes 350,000 cases of blindness and has been linked to 1 million+ deaths each year Highly controversial a. Proponents Reduce incidence of blindness and other VAD related health disorders 1/2 lb of rice/day will keep VAD symptoms away b. Opponents Nutritional deficiencies will prevent people from absorbing beta-carotene from rice Concentrations of beta-carotene in rice are low, and an average woman would need to eat 16 lbs of golden rice a day to get 100% of daily requirement Alternatives like leafy green vegetables or unpolished rice are better, cheaper sources of vitamin A Western corporations are trying to control rice production
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