Forum:DNA Surgery and other type changes

You know type-changing cards such as DNA Surgery etc. When it is activated, can you select ANY type including "Toon", "Spirit", and "Gemini" (i.e. There is also "Divine-Beast" and "Fusion")? I know that certain effects pertaining to the type isn't applied during a type-change such as selecting "Toon" to allow your monsters to attack directly. I know that much. But also, after selecting a type, does the monster become just that ONE type or will it be such as turning a "Red Eyes B. Dragon" into a "Fairy" making it a "Fairy/Dragon" or just "Fairy"?