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Het is short for Heterozygous, yes.

And heterozygous means exactly and only "the two genes of the pair are different".

A royal python that is heterozygous for Albino has one albino gene and one not-albino gene on that gene pair and looks normal.

A royal python that is heterozygous for Pastel has one pastel gene and one not-pastel gene on the pastel gene pair and looks like a visual pastel.

And a royal python that is heterozygous for Spider has one spider gene and one not-spider gene on the spider gene pair and looks like a visual spider (which looks exactly the same whether it's het or homozygous).
 

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A royal can be heterozygous for a spider morph but it will not necessarily lok like a spider morph. Only if the Spider allele is dominant will it look like a spider. If the spider allele is reccessive it will look normal. But have good chance of producing spider offsoring if mated withanother het spider or spider. Hope that helped
Spider IS dominant, Ste - that's what I described in my example.

A het spider royal is visually a Spider royal.
A homozygous spider royal is visually a Spider royal.
A royal who is not carrying Spider at all is a normal.

Part of the problem is that people do not understand that dominant and codominant morphs have hets too - it's just the LOOK that is different.
 
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