If you are interested in avoiding genetically modifed foods these are the
GMO FOOD CROPS:
yellow crookneck squash
alfalfa for hay
Some of the derivatives:
canola oil, corn flour, corn masa, corn meal, corn oil, corn sugar, corn syrup, cornstarch, cottonseed, dextrin, dextrose, glucose, high fructose corn syrup, hydrolyzed vegetable protein, maltodextrin, protein isolate, soy flour, soy isolate, soy lecithin, soy milk, soy oil, soy protein, soy isolate, soy sauce, sugar, tamari, tocopherols (vitamin e), tofu, vegetable fat, vegetable oil.
If possible consider buying the organic version of these products and/or buy products that say non-gmo (the non-gmo project). Below is a link to a documentary on the subject and a link to a non-gmo shopping guide: