Cross anything to a Visual Axanthic ball python and all of his/her offspring will be 100% Het (for that Axanthic type) regardless of background genetics.
Fire, Pastel, and Spider are both incomplete dominants-so they will be visually expressed in the Het Form. If they are not visually present-then they are not in the snake.
If you have a 'Normal' ball python from the female listed above then it is 100% Het VPI Axanthic, 0% Het for Fire, 0% Het for Pastel, and 0% Het For Spider... (aka just a 100% Het for Axanthic).
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