Podcast
Questions and Answers
Which of the following are controversies in biotechnology? (Select all that apply)
Which of the following are controversies in biotechnology? (Select all that apply)
What is the purpose of Gene Switching in biotechnology?
What is the purpose of Gene Switching in biotechnology?
To control specific genetic material in plants for desired results.
The StarLinkTM corn is approved for human food use.
The StarLinkTM corn is approved for human food use.
False
What significant risk does the Cry9c protein in StarLinkTM corn pose?
What significant risk does the Cry9c protein in StarLinkTM corn pose?
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The release of Bt in crops helps to reduce the development of _____ resistance.
The release of Bt in crops helps to reduce the development of _____ resistance.
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Which organization directed Aventis to facilitate proper disposal of StarLink corn?
Which organization directed Aventis to facilitate proper disposal of StarLink corn?
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Study Notes
Gene Switching & GURTs
- Gene switching is a biotechnology-based technique used to control the expression of specific genes in plants.
- Gene switching mechanisms can be activated or deactivated in response to external triggers, like rainfall or light patterns.
- Natural gene switching occurs during seed germination.
- Researchers aim to utilize gene switching to activate genes only when needed. This can lead to resource conservation and optimization, such as producing drought tolerance genes only during drought conditions.
Potential Uses of Gene Switching
- Development of “sentinel plants” that signal nutrient deficiencies or pest infestations, allowing farmers to apply pesticides and fertilizers only when necessary.
- Targeted release of pest protection mechanisms, further reducing pest resistance.
- Development of sterile progeny, enhancing environmental risk management, particularly in areas with stringent biosafety frameworks.
StarLink™ Corn Issue
- Aventis Crop Science developed StarLink™ corn containing the Cry9c gene for resistance against European corn borer.
- The EPA approved StarLink™ for animal feed and industrial uses, but not for human consumption due to slow protein digestibility and uncertain allergenicity.
- StarLink™ corn was detected in taco shells, resulting in a recall of contaminated products.
- The EPA canceled the registration of StarLink™, and Aventis bought back all of their seeds.
- While there were alleged cases of allergic reactions, most were not confirmed by the CDC & many experts believe the issue was overblown.
- The StarLink™ controversy highlighted the need for thorough testing and regulatory approval for all genetically modified food products.
- It emphasized that in various regions like the Philippines and Asia, many food products are marketed without comprehensive food tests and other essential biochemical evaluations.
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Description
This quiz explores the concept of gene switching and its application in biotechnology, particularly in plants. It delves into how gene expression can be controlled by external triggers and discusses potential uses, including sentinel plants and environmental risk management. Understand the implications of this technology for agricultural practices and biosafety.
