Thanks for that clear and "in a nutshell" answer

But, 2 more questions, if i may
One is, if i were to grow a plant called Tomato F1 Cossack variety (for example)
While i understand that its still an F1 hybrid, but would it still be a
COSSACK variety, i mean? Meaning in taste, growth pattern etc?
Secondly, how are these seed companies able to sell seeds from an F1 hybrid, and be variety specific?
Surely, what with F1s not being true to type, any plants grown from the above example wouldnt be...........a Cossack tomato
Reg