Killer Bee Ball Pythons are the result of the combination of Super Pastel (codominance of Pastel genes) and spider genes. They have the yellow color of the Super Pastel and the pattern of Spider.

Some definitions of genetics...

Allele : alleles are the different versions of the same gene
Dominant allele : an allele is said to be dominant if he is able to pass alone a characteristic trait of the parents to the descendants.
Recessive allele : an allele is said to be recessive if he is not able to pass alone a characteristic trait of the parents to the descendants.
Co-dominant allele : alleles are said to be co-dominant when together they are able to pass a characteristic trait to the descendants.
Homozygous : An individual is said to be homozygous for a given gene if he possesses two identical alleles of this gene.
Heterozygous : An individual is said to be heterozygous for a given gene if he carries two different alleles.

male	female	descendants
Killer Bee	Normal	50% of the descendants are Bumble Bee 50% of the descendants are Pastel
Killer Bee	Pastel	25% of the descendants are Killer Bee 25% of the descendants are Bumble Bee 25% of the descendants are Super Pastel 25% of the descendants are Pastel
Killer Bee	Super Pastel	50% of the descendants are Killer Bee 50% of the descendants are Super Pastel
Killer Bee	Bumble Bee	37,5% of the descendants are Killer Bee 37,5% of the descendants are Bumble Bee 12,5% of the descendants are Super Pastel 12,5% of the descendants are Pastel
Killer Bee	Killer Bee	75% of the descendants are Killer Bee 25% of the descendants are Super Pastel