So you're saying I would likely get the best results from breeding both of the crosses with each other? I had assumed that perhaps continually crossing a "purebred" so to speak with a crossbreed might be the best way to dial in the traits I want. You're correct though with the characteristics I might get, maybe I just get a more mild superhot instead of a a larger one. I wish there were a way to accurately calculate this.
Thanks for the reply!
Well, I was suggesting that you should add that combination to your other listed crosses. It's really difficult to accurately predict the outcome so it's just to play the numbers game and give yourself a better chance.
Allowing the original F1s to self-pollinate is also arguably the easiest cross to do (just put a mesh bag over the plant if it's outside - verses collecting pollen and clipping stamens, etc.) so there's no reason not to do it.
There is some literature on pepper genetics, some is easy to find, some is hard. If you want some specific scientific literature on the subject I could help you out (fair warning - it's complicated).
The dominant traits are usually for small, medium spicy, and red mature fruit. (Maybe S/s for size; P/p for spicy)
To be super simplistic Superhots are SS and PP and Bell pepper is ss and pp
F1 = Ss and Pp which is still a small hot fruit
F2 will look like this: ~56% are small hot fruit, ~19% are large hot fruit, ~19% are small no heat fruit, ~6% are large no heat fruit. Only ~19% of your plants will have what you want.
Obviously it's way more complicated multiple genes code for size and shape and multiple more are related to capsaicin production. Might be that only ~5% of F2 plants have close to what you are looking for.Go to the full post