hybrid seed is old
Hybrid seeds were used for about 100 years, a long time before DNA was even discovered
As per Mendel, if you plant seeds grown from hybrid seeds you'll get a proportion of each of the breeds used to make the hybrids, and some will even breed true, that is you'll get the original hybrid.
Yes, they won't have the original productivity, but then the inbred plants used to make the hybrid had a worse productivity than the hybrid anyway.
We're no longer using pure breeds because they are not as productive as a few of the hybrids they are used to produce, and even Monsanto/BASF/etc. propagate the pure breeds, else they won't be able to provide hybrid seed.
Biting the hand that feeds IT
