Summary
Genetically modified organisms (GMOs) in agriculture involve altering the DNA of plants and animals to improve food production and quality. GMOs can be engineered to resist herbicides, pests, and enhance nutritional value, contributing to increased yield and food supply. Ethical and societal concerns include potential health impacts, environmental effects, and economic implications for farmers.
- Genetically Modified Organism (GMO) — an organism with recombinant DNA created through genetic engineering. Example: GM salmon grows faster due to a promoter gene from ocean pout fish.
- Herbicide Resistance — genetic modification allowing plants to survive herbicide application. Example: Soybeans resistant to glyphosate increase yield by reducing weed competition.
- Insect Resistance — genetic modification enabling plants to produce their own insecticide. Example: Bt cotton produces Bt toxin to kill pests, reducing pesticide use.
- Recombinant DNA — DNA that has been formed artificially by combining constituents from different organisms. Example: Used in GMOs to introduce desired traits from other species.
Exam Tips
Key Definitions to Remember
- Genetically Modified Organism (GMO)
- Herbicide Resistance
- Insect Resistance
- Recombinant DNA
Common Confusions
- GMOs are not the same as selectively bred organisms.
- Not all GMOs are used for food production; some are for medical purposes.
Typical Exam Questions
- What is a GMO? An organism with DNA altered through genetic engineering.
- How does herbicide resistance benefit agriculture? It allows crops to survive herbicide application, increasing yield.
- What is the role of Bt toxin in GM cotton? It acts as an insecticide, reducing the need for chemical pesticides.
What Examiners Usually Test
- Understanding of how GMOs are created and their applications.
- Ethical and environmental implications of using GMOs.
- Differences between genetic modification and traditional breeding methods.
