Morph question

[nevohraalnavnoj]

What morph comes out when you breed a spider ball python with a yellowbelly ball python?

I believe it would be

25% normals
25% spiders
25% normals het ivory
25% spiders het ivory

Aren't all yellowbellys already het for ivory? So anything that came out would be pos-het, unless you could successfully identify it?

JonV