1. Scientists have known that genetically altered traits like resistance to herbicides can be transferred from crops to related weeds through cross-pollination. 2. The gene exchange need not be a problem if closely related weeds are not in the area of the crops, Fehr said. 3. The oilseed rape was planted in the field with a closely related weed, Brassica campestris, and hybrids resulted that looked like the weed. 4. Scientists tracked the spread of natural genetic material from chloroplasts in oilseed rape to a related weed. |