Apparently the answer is not settled on that yet.
http://advances.sciencemag.org/content/2/8/e1600850
https://www.npr.org/sections/thesalt/2016/09/01/492091546/ho...
http://advances.sciencemag.org/content/2/8/e1600850
https://www.npr.org/sections/thesalt/2016/09/01/492091546/ho...
http://weedcontrolfreaks.com/2017/04/gmos-and-herbicides-its...