Biology 20B- May 21

Biology 20B- May 21 - May 21, 2009 Biology 20B Lecture...

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May 21, 2009 Biology 20B Lecture Genetic Engineering: - traits o designer foods o herbacide resistance o Bt toxin o Viral resistance o Antibody proteins for medicine - Risks o Human health allergies to Bt toxin o Ecological effects Nontarget effects Monarch butterfly Eats pollen from Bt corn and dies Spread of genes to other species Hybridized with weeds and makes SUPERWEEDS USDA focuses primarily on agriculture - Golden Rice o Vitamin A Deficiency leads to blindness, estimated 350,000 children a year o Rice is a staple for 3 billion people o Ingo Potrrykus engineered a rice plant that makes vitamin A precursor Used genes from bacteria and daffodils - Starlink Corn o Gene from bacterium, kills insects (Bt) o Makes resistance to corn o Some people are allergic o Approved for cattle, not humans o Starlink corn showed up in human food ~50% of U.S. corn products - all GMO have risks and benefits - we may not be able to predict all risks - as a society, we choose the risks
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Biology 20B- May 21 - May 21, 2009 Biology 20B Lecture...

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