Maybe a help
http://ballpythons.ca/genetics_101.html
Basically I think some are confusing the mutation type (co-dominant or dominant) with the genotype (heterozygous or homozygous mutant). Because hets have an unmatched pair of genes there is a 50/50 chance of which copy they will pass to each offspring. As far as we know, all spiders so far are heterozygous for the spider mutation.
Most pinstripes are heterozygous but as the first proven dominant ball python mutation we know that a homozygous pinstripe looks the same. But a heterozygous pinstripe still has a 50/50 chance of giving pinstripe to each offspring even though the mutation type is dominant. Dominant just tells us how the homozygous pinstripe looks in relation to the heterozygous pinstripe.
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