I can certainly understand the reason for your question.
When you're new at anything, you have lots of them & even though some may be "old-hat" to long-time fanciers with years of experience, I could see myself wondering that same thing years ago. In fact, I probably did ask that very same question to the guy that first helped me get started.
There are no stupid questions & terminology is not what you were really asking here, though it is nice to have the correct word for something as you learn.
I think it was a fine question. After all, who would want to hatch out a three-headed chicken if the mating of two close relatives would cause that? But then again, Mike the headless chicken made lots of money for his owners. But that's another subject!
Good luck & keep asking whatever you need to know. It's obviously the only way we learn, except by mistakes & this way is easier!