[ChrisFoster]

That's biologically impossible, but we might end up with weeds which resemble the crop in new and interesting ways.

This has already happened in history for weeds which came under artificial selective pressure due to practices of separating seeds, etc. The fascinating thing is that some of these weeds took on so many of the desirable properties of the primary crop that they became crops in their own right. Rye and oats originally being mimicks of wheat for example: https://en.wikipedia.org/wiki/Vavilovian_mimicry

[PeterHolzwarth]

I tend to not be a fan of replies that are just "thanks" etc, but I must say here: thanks for your comment and link - that is ridiculously fascinating.