Het stands for heterozygous, meaning one copy of a gene. Each parent can contribute only one copy of a gene to it's offspring for each morph. Let's take Mojaves, my favourite. They are co-dominant, so a heterozygous Mojave is a Mojave visually...and a homozygous (two copies of the gene) Mojave is the blue-eyed white-bodied Super Mojave.
Now for recessive traits...a snake needs two copies of the Clown gene to look like a Clown. If they only have one copy of the gene, they look like any other normal snake...except if you breed them to a Clown, you have a 50% chance of getting another Clown in the offspring.Breeding for hets is easy...breed a homozygous animal to a normal and bam, hets.
Since recessive traits are not visually expressed you need to trust your breeder about what you are getting, obviously.
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