Yellowbelly x spider?

I've never bred before (not going to for a while) but i was thinking of pairing my yellowbelly male with a spider female when they reach the size. What are the possible offspring? Should i pair the two or..? I'm not sure if either of the snakes are het for anything.

You would get 1/4 yb spider 1/4 yb 1/4 spider and 1/4 normals thats not exact just your chances of producing each one

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For future reference, World of Ball Pythons has a genetic calculator that's pretty helpful: http://www.worldofballpythons.com/wizard/