do now 3.26 (week 30)
DESCRIPTION
Do Now 3.26 (Week 30). Objective: Describe and evaluate the impact of transgenic organisms on food production. Tasks: Pass forward last week’s Do Nows Syllabus change: All topics moved forward 1 day, except review and test ( Th /F). - PowerPoint PPT PresentationTRANSCRIPT
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Do Now 3.26 (Week 30)
• Objective: Describe and evaluate the impact of transgenic organisms on food production.
• Tasks:1. Pass forward last week’s Do Nows2. Syllabus change: All topics moved forward 1 day,
except review and test (Th/F).3. If you were a technology leader for an agricultural
biotech organization, what genes or characteristics would you put into food crops? Why?
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Corn……is pretty important in our society.
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Corn Chips
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McDonald’s Meals
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Drinks
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Most Foods
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Your Car
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Demand is growing:
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Demand is growing:
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Demand is growing:
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European Corn Borer:
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European Corn Borer:
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Whatever shall we do?
Option A: Insecticides
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Whatever shall we do?Option B: I.P.M.
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Whatever shall we do?
Option C: Genetic Technology
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Introducing Bacillus thuringiensis:
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Enter Bt Corn…
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Yay!!!! – Problem solved, right?
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Problem 2: Weeds. Product = RoundupReady ® Crops
This field of corn has lots of weeds in it. Weeds take nutrients from the soil the corn plant needs.
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RoundUp Ready Corn
• RoundUp is a chemical that kills plants.
• 90% of the corn grown in the US is genetically modified to have resistance to RoundUp.
• Since the corn is resistant, farmers can spray roundup and kill everything but the corn
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It worked for a while…
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But there was VARIATION in the weeds• A tiny % of the weeds were naturally
resistant to the RoundUp and survived…
ResistantWeed
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Now, that weed had offspring… and they had offspring… etc. etc.
• Since resistant weeds are the only ones that survive and reproduce, they are now far more common in corn fields.
ResistantWeed
ResistantWeed
ResistantWeed
ResistantWeed
ResistantWeed