As Annarose said both parents only have 1 codom gene (out of 2, if they had 2 they would be supers), so there is a 25% chance per egg that both parents will not pass the morph gene, resulting in a normal BP.
For more info on BP genetics I recommend checking out this helpful article by Judy: http://ball-pythons.net/forums/showt...Basic-Genetics
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