Comment Re:So, does water cost more? (Score 1) 377
"So, cover the entire planet with corn for thousands of years and your single desired gene has a decent chance of appearing spontaneously."
Correct, if we were looking for a truly spontaneous event, you are absolutely correct. But we aren't. We're looking for a mutation as a result of a intentional change in environment, or as an existing trait that is intentional breed for.
If we are looking for a selectively bread Corn plant that is roundup resistant, averages 1.3+ ears per stalk, has a good flavor, has an acceptable growing period, and is disease/drought resistant for the regional climate, it's not like we're going to wait for the perfect kernel somewhere out in the 'corn world' to just by chance have all of those traits.
In fact, all of those traits except for the roundup resistance had already been developed through selective breeding long before scientists got involved.
If we take a field of non-GMO corn, and apply a light spraying of Roundup on it, much of the corn will die. But odds are some of the stalks will survive due to as you put it, "a relatively minor mutation to one or more existing genes which makes the plant more resistant". If we breed those surviving plants together, odds are that gene will propagate on, along with some minor mutations. And if we again spray the field with roundup, we will again kill off those without resistance. This is the exact same function whether we apply it to weeds or to corn.
Keep this up for a couple of generations and we have a roundup resistant corn plant without any scientists involved. From there, it's just a mater of selectively breeding back in a combination of taste/resilience/yield if any were lost over the previous selective breeding.
Spontaneously, yeah, incredibly unlikely to ever occur. Realistically though, a person could go out and do this in a small field over the next 20 years and have a product ready to ship.
-Rick