Why would some cross an F5 with an F2?

[McMuffin]

To everyone reading this thread: Open wide and step up to the fire hydrant of knowledge!

Thanks for the great information @Fuel! Of course I still have questions

@Fuel

Yes, but because the heterosis play as a cement and in a way as a recombination agent. But you can encounter unstables F1 or lines than are stable and appear like clones until the F4 … the background one more time;

That must be extremely frustrating. And seemingly unavoidable?