It may help to remember that there isn't "a super pastel gene" as such. Super pastel is the name we give to the apperence of an animal when both of it's genes at the pastel location have the pastel mutation. So a super pastel doesn't have a single super pastel gene, it has two pastel mutant genes (i.e. a super pastel is homozygous pastel). Each baby has a 50% chance as to which of a parent's two copies of each gene it gets but because both copies at the pastel locus are the same with a super pastel we know it will give a pastel mutant copy to all offspring.

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