ECOL 1000 1nd Edition Lecture 28 Outline of Last Lecture I. Selective breeding vs. genetic modificationII. FrankenfishIII. Bt cornIV. Golden riceOutline of Current Lecture II. GMOsIII. MosantoIV. Bt corn case studyV. Regulation of GMOsCurrent Lecture- GMOSo Improve nutritional valueo Faster growtho Longer shelf lifeo Resist pestso Resist harsh environmentso Tolerate herbicideso Medical treatments- Monsantoo Manufactured DDT in 1944o 1982-first genetically modified plant cello 1987-first field tests of GM cropso 2002-biotech gianto Many lawsuits filed against farmers for saving seedsThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- Environmental risks of Bt corn: case studyo Lepidoptera could eat pollen that falls on host plants o EPA response: Monarch breeding and bt pollen shed may not coincide- Challenge: monarchs use cornfield milkweed throughout the growing season Monarchs prefer milkweed away from corn- Cornfield milkweed supports higher per plant monarch densities Typical pollen levels have little to no effect Few milkweeds are found very close to cornfields- Milkweed is common in and near cornfieldso Ecologists Monarchs may be particularly susceptible to impacts of exposure to bt-corn pollen- Most monarchs in Mexican come from the ‘corn belt’- Monarchs lay eggs on milkweed in corn fields Modus Operandi: safe until proven unsafe- Bt-corn was licensed before ecological effects were adequately studied- Licensing decisions based on incomplete and inaccurate information- Strain of bt corn expressed low levels of toxins in pollen- Regulation of GMOso USDA-evaluates potential risks of GMOs to livestock and cropso EPA-evaluates genetically modified plants for environmental safety (toxins in the environment)o FDA- evaluates pharmaceuticals, food products and
View Full Document
Unlocking...