Seeking the Bt gene in food made from corn

The Search for Bt Click on the link to see our lab in action!

We extracted DNA from tortillias, fritos, gummy bears, chicken feed, popcorn,cheerios, polenta and jam.  We used PCR to amplify the corn invertase gene (to show we had corn) and the Bt toxin gene (to see if the food contained genetically modified corn).  We used agarose gel electrophoresis to see whether the corn invertase gene and the Bt gene had been amplified. We showed that corn DNA was indeed present in everything except gummy bears, jam, and cheerios; but we didn’t amplify the Bt gene. Apparently none of the corn in the foods we studied was genetically modified.



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