What does Bt crop make?
Reveal answer
An insecticidal toxin.
Key words: toxin
6(c) GENETIC MODIFICATION (GENETIC ENGINEERING) · RECALL
6.15 Genetically modified plants and food production
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Why herbicide-resistant crops?
Reveal answer
Spray kills weeds only → less competition → higher yield.
Key words: weeds
What does Golden Rice make?
Reveal answer
Beta-carotene (vitamin A).
Key words: beta-carotene
Concerns about GM crops?
Reveal answer
Superweeds, resistant insects, unknown effects, cost.
Key words: superweeds
Source of Bt gene?
Reveal answer
A bacterium.
Key words: bacterium
Why do GM crops raise yield?
Reveal answer
Less pest damage + fewer weeds.
Key words: pest
What is meant by the term Bt toxin?
Reveal answer
An insecticidal protein from the bacterium Bacillus thuringiensis.
Key words: Bt toxin
What is meant by the term herbicide resistance?
Reveal answer
The ability of a plant to survive a chemical weedkiller.
Key words: herbicide resistance
What is meant by the term GM crop?
Reveal answer
A crop plant whose DNA has been altered by genetic engineering.
Key words: GM crop
Types of GM crop, Bt pest resistance. How it improves food production? Possible concern?
Reveal answer
How it improves food production: Less insect damage; less insecticide sprayed. Possible concern: Insects may evolve resistance; non-target insects affected.
Key words: Bt pest resistance
Types of GM crop, Herbicide resistance. How it improves food production? Possible concern?
Reveal answer
How it improves food production: Weeds removed without harming crop. Possible concern: Reduced weed biodiversity; resistant weeds may develop.
Key words: Herbicide resistance
Types of GM crop, Golden rice. How it improves food production? Possible concern?
Reveal answer
How it improves food production: Source of beta-carotene for vitamin A. Possible concern: Cost, acceptance and diet diversity issues.
Key words: Golden rice
True or false, and why? “Eating GM crops changes your genes.”
Reveal answer
False. Digested DNA does not alter the DNA in your cells.
True or false, and why? “GM crops always increase yield.”
Reveal answer
False. They may increase yield where the targeted problem limits growth; effects vary.
True or false, and why? “Bt crops kill all insects.”
Reveal answer
False. The toxin affects certain insect groups that eat the crop.