Pinstripe is considered to be a dominant pigmentation allele. Homozygous dominant for pinstripe appears to be embryonic lethal as it seem that nobody has been able to generate a "super pinstripe" as we would expect if the pinstripe gene were incomplete dominant (co-dominant in ball python land). I've also not heard of anyone generating a pinstripe that when bred to a normal produced only pinstripe offspring (as would be expected if there was a homozygous pinstripe animal that had no difference in phenotype between the heterozygous and homozygous animals).
If you have one pinstripe, each baby has an equal chance of being pinstripe or normal for the pinstripe gene.
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