Either 50% het or 0%. Usually, a 50% het is bred to a visual morph to prove whether or not it is in fact a het. If you have a 50% het, and breed it to a normal, you really can't say the babies are anything other than normals. If it's a male, you could hold back all the females from the breeding and raise them up for 2-3 years to breed back to the 50% poss het to see if you hatch any pieds, but breeding a 50% het to a normal is pretty much the same as breeding two normals together. These days, you would almost have the same odds of hatching a morph from a 4 year project like the one you are talking about, as you would from doing the same pairings with any normal cb male. If it's a 50% poss het female, I would buy a het male to breed to her next year.
To answer your question, Some would say you'd have 25% hets. I'd call them 0%, until you prove the poss het parent is a het. I have a bee that's poss het albino, but until he fathers an albino, he's just a bee.
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