Lecture 20

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Unformatted text preview: de called Bt, according to a new research report. How might you prevent the evolu3on of pes3cide resistance when using BT strains of crop plants? Bt strain Non- Bt refuge When transgenic crop strains such as Bt corn are used that “make their own pes3cide”, it is now mandated by federal law that a farmer has to plant non- Bt refuges, so that non- resistant varie3es of crop pests can con3nue to find food and flourish and interbreed with resistant strains of pests, thus limi3ng their propor3on in the overall popula3on. Concern: It is very hard to police this policy – Bt corn looks just like regular corn varie3es. Main applica3ons of transgenic organisms in agriculture: Weed control Round- up Ready transgenic crops Environmental Benefits: -   Allows no- 3ll farming by reducing need to plow as a means for weed control Drawbacks: - Evolved resistance to Round- up in weeds. Evolu3on of “superweeds”. - Increased use of herbicides Number of Evolved Glyphosate- Resistant Weed Species Source: World Resources Ins3tute A gene coding for an enzyme that rapidly metabolizes the weed- killer round- up has been inser...
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This note was uploaded on 01/30/2014 for the course IB 105 taught by Professor Caceres during the Fall '08 term at University of Illinois, Urbana Champaign.

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