AquaBounty's salmon (background) has been genetically modified to grow bigger and faster than a conventional Atlantic salmon of the same age (foreground.)
Courtesy of AquaBounty Technologies, Inc.
Wheat grows in a test field at Oregon State University in Corvallis. Some scientists believe that there's a chance that genetically modified wheat found in one farmer's field in May is still in the seed supply.
Natalie Behring/Bloomberg via Getty Images
Russ Kremer with some of his hogs on his farm in Frankenstein, Mo., in 2009. Instead of buying conventional feed, Kremer grazes his hogs in a pasture, and grows grains and legumes for them.
Jeff Roberson /AP