Genetically modified plants usually have one main modification. Often this is a resistance to Scotts Roundup, a weed killer. This is so that a farmer can spray his crops with the weed killer and not kill his crops. I am not so much concerned with the genetic modifications. Plants change all the time and the genes for Roundup resistance don’t have much to do with what I eat. What bothers me is that the food I get will have large amounts of weed killer in it. The plant absorbs the weed killer and then I eat it.
Lots of plants are being genetically modified. Some plants are being altered to improve their nutritional value. Some are being altered to resists disease and pests. Most are being altered to resist weed killers.
What is being discovered is that the genes are escaping into the wild. The genes for several different modifications are jumping out of the fields due to pollinators (like my bees). Wild varieties of plants such as wild canola plants have been found to have the modified genes, from multiple sources.
I don’t know if the genes are crossing species, but in the case of wild canola, it is essentially the same plant as the cultivated canola. The weed, wild canola, is now resistant to weed killers, and it’s not just one gene but several different crossbreeds of commercial modified plants, perhaps creating a super weed.