Yeah what they said. There's always been some speculation as to whether or not there is or is not a "super" spider. It may be that it is a lethal gene and kills the babies before they hatch or it could just look like a normal spider and the only way to tell would be to breed it to multiple normals and have them throw 100% spiders every time .

But yeah to answer your question from that pairing your odds would be something like 50% pastel, 25% spider and 25% bumblebee.

Do you actually have a spider and a super pastel?