Lets try just spider x het albino. One half of the animals, speaking strictly from probability, will be het albino. One half will not. However, one can't identify which ones are and aren't het albino. So each snake has a 50/50 chance of being a het. So that is where 50% het comes from. So the clutch will be 50% normals and 50% spiders all 50% het albino
Try to wrap your head around that first, because it gets trickier with two gene hets.
A normal x het albino/pied will be normals 25% het nothing, 25% het pied, 25% het albino, 25% double het.
Keep in mind that these are just probabilities and not guaranteed ratios.
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