In plain terms:

Each parent has their DNA unzip like a zipper and only half goes to the baby. It combines with half of the other parent's genes. There are some genes that go across both halves of the zipper (dominant) and some that require both halves of the zipper to have the trait in order to be able to SEE the difference from a normal (recessive). Pastel, spider, and cinnamon are all co-dominant, meaning that you can see when the gene is on one half of the zipper, and they look different and more 'extreme' or 'super' when it's on both halves of the zipper. It's possible that you get the 'normal' half of the zipper from each parent in this situation.

Hope this didn't make it MORE complicated...


... and yes, I realize there is a debate about the Spider gene. All that's important here is that a snake that looks like a spider has a 50% chance to pass that on.