If you are interested in the snake, you call the guy and ask what he means by "25% het." If he can give you the entire family tree of the animal, then you can decide whether the chance of catching a gene from that tree is worth whatever he's asking. If he can't give you the entire family tree of that animal, you have to decide whether he has any clue about genetics. If he doesn't seem to have a clue, you should consider the snake to be a normal and decide whether that normal fits your plans.

Most people admit to selling normal-looking hatchlings as normals if there's no place for them in a breeding program. However, many of these breeders are trying to produce morphs and are producing hatchlings from morphs and hets. One can assume that the average CBB ball python may have some recessive trait in its genes because relatively few people are breeding normal ball pythons to normal ball pythons just to produce more normal ball pythons. If you really have to know that it doesn't have some recessive gene, you're going to have to do major geneology. If you really have to know that it does have some recessive gene, you shouldn't count on a 25% chance.


Bill
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It's not how many snakes you have. It's how happy and healthy you can keep them.

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