what the heck is het?

[Sublimeballs]

Someone correct me if I'm wrong, it's been a while since biology class.

Het is short for heterozygous; meaning one of two alleles on a genetic locus has a mutation. Het applies to not just ressecive traits as everyone has listed(but is mostly only used to describe recessive traits in our hooby), but dominate and co-dominate traits.

When both the alleles carry the mutation it is the homozygous form.

In recessive traits both alleles are required to carry the mutation to show a morph. (Homozygous)

In dominate traits only one has to carry the mutation to show the morph(heterozygous); if both carry the mutation(homozygous)it still appears the same as if only one carried it.

In co-dominate traits it will show a mutation in the het form like dominate traits. But, unlike dominate traits, in homozygous form it produces the "super" morphs.