Pinstripe?

[SlitherinSisters]

It is dominant because the super aka homozygous looks exactly like a normal pinstripe aka heterozygous. remember your punnet squares?

Pin x Pin breeding

PP = homozygous or super pin
Pp = heterozygous or normal pin
pp = no trait aka normal

the "PP" and "Pp" look exactly the same, therefore it is dominant, so to answer your question yes the breeder is wrong or just mistyped it.

Thank you for posting that. I hate those dang punnet squares and I wasn't sure how to explain it without using one.

Every dominate gene has a super form by genetics standard, they just don't have a visual super form. If you breed two pins together, there will be some pins out of the mix that are 'super pins' or homozygous to be correct. Those ones will only throw pins, just like a super pastel (a visual homozygous). Pins are not codominate by any means though, not sure how a breeder wouldn't know that. That's one of my biggest pet peeves, if you don't even know what you are breeding and the basics of their genetics why the heck are you breeding...