The snakes you refer to as "super doms" are actually incomplete dominants.
An incomplete dominant is a ball python that, when bred to another ball of the same morph, creates the "super" form. It is called an "incomplete" dominant because it takes two copies of the same gene to have the true form present itself. Ball pythons like spiders are known as dominants, because it takes only one copy of the gene for the true form (homozygous form) to show up.
The pastel gene is an incomplete dominant. Just one pastel gene will overpower the normal gene, but two pastel genes are needed for the "complete" morph.
The spider gene is a dominant gene. Just one spider gene is required to show the complete morph, and there is no "super" form when two spider genes are present.
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