1) The growth of crop plants resistant to herbicides is controversial. Proponents claim that growth of such plants will increase crop yields. Opponents claim that the genes for herbicide resistance can be transferred to weeds, which will then be resistant to the very herbicide designed to kill them. a. Is the yield of herbicide-resistant crops greater than nontransgenic plants? b. Transfer of transgenes from crop plants to weedy relatives- fact or fanciful? Find sources that support your conclusion. 2) You've read a news item in Scientific American about the use of plants as factories to produce vaccines for human therapeutic use. Find other articles that describe how such antibodies are produced and describe the advantages and disadvantages of producing antibodies in plants.