Ok, so I've gotten to the third tank environment (finally) and now I seem to be able to breed just about everything. I'm going over the combinations, making an excel spreadsheet (yes, I know you can get the answers from several places on the web, but what fun is that?). Have some questions now at this level. I'm really only looking for yes/no kinds of answers here, not spoilers or spelling it all out for me. (Note: In all the questions below I am precluding the use of mutating/chemical/other agents to modify what the fish do/are/have. I just want to understand the nature of what goes on without additional external influences.)

1) If I continuously breed fish-A with fish-B, will I always get fish-C? As you are probably aware, in the case of genetics and reproduction, the same two parents can produce three very different looking children (as was the case in my family--fortunately I got all the brains). Is there ever a chance that breeding fish-A with fish-B might produce fish-D instead of fish-C?

2) If A+B=C, is it always true that B+A=C? For example, if fin-type-A + fin-type-B = fin-type-C, will fin-type-B + fin-type-A always have the same result (fin-type-C, in this case)? Does this also apply to fish type?

3) Are there any fins or fishes that absolutely CANNOT be bread and must be obtained from eggs? If there are, don't tell me which ones (I'll find out the hard way), just want to know if that is the case or not.

4) If I am dilligent, and keep cross-breeding fin types (presume same fish type for mother and father, e.g. golden beta with silky beta, greenfin beta with pink beta, etc.), will I eventually expose ALL fin types for that fish?

5) Do ALL fish types have ALL fin types and vice versa, or are there some combinations that don't exist?