'Het' just means two different alleles at the same point along the dna strand that makes up an animal.

Pastels are not simple recessive traits, they are co-dominate which means an animal only needs a single alleles in the pair to have a visual manifestation of the 'Pastel' trait. When a co-dominate morph is homogeneous, you get a different looking animal from a normal and the 'het' version. Then there are dominate traits, which look the same in both the het version and homogenous version (ie a normal is a dominate trait. Spiders and pins are also examples of dominant genes.

No typical normal looking ball python will ever be a pastel, spider, woma etc. in a 'het' way, like a simple recessive. If it carried any of these morphs on a single alleles, they would look distinctively different from a typical 'wild type' normal.
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PHLdyPayne

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