Grace Hood / KUNC

When unapproved genetically modified wheat was found growing in Oregon earlier this year, it didn’t take long for accusations about how it ended up there to start flying. A flurry of initial finger-pointing cast potential blame on a federal seed vault in Fort Collins, Colo., which housed the same strain of wheat, developed by Monsanto Corp., for about seven years up until late 2011.

Amy Mayer / Harvest Public Media

People have been cross-breeding plants for thousands of years, manipulating traits in agricultural crops from generation to generation. When scientists discovered that they could actually modify the genes of these plants in a laboratory, the landscape of agriculture changed dramatically -- and fast.