>yeah,but what i am saying is that GM pharm crops are used to >produce drugs and industrial chemicals,right.Whats to stop >the dna that produces those drugs and chemicals escaping and >thus those drugs and chemicals entering the food chain?
natural selection gets rid of "unneccessary" traits.
GM plants are being used to produce pharmaceutical things like vitamins (golden rice) and vaccines. GM animals are generally the ones used to produce drugs and industrial useful proteins. like i said, nothing besides buffer area can really prevent a gene from running away if you are dealing with a wind-pollinated plant. however, native species would rather pick up a gene that makes them herbicide resistant than a gene which makes them produce a pharm. substance that they dont need. it takes away from the plant's resources to make the pharm. agents and if there is no benefit to the plant natural selection will weed the useless genes out. i hope that's a clear enough description of the situation.