An offspring is either het or he he is not in other way he carries the gene for the recesive morth or he does not.
When a homozygous animal is paired to a normal there is obviously no question that all the offsprings will carrry the recessive gene and therefore they are reffered to as het or 100% het, now the tricky part is when a het is paired to a normal or a het.
In both cases if you pair a het to a het or a het to a normal not all the normal looking offsprings will carry the gene for the recessive Morph, some will and some won't, however since it is impossible to distinguish which ones do and which one don't, all the normal looking offsprings are referred to as possible het either 66% or 50% depending on the original pairing.
This mean if you purchase a possible het from a het x het it has 66% chances to be a het and the only way to find out whether the animal you bought is a het or whether it is a normal will be by breeding the animal and proving or disproving him.
Same goes for 50% het.
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