Someone better with genetics please correct me if I'm wrong on this, but to my understanding, there isn't a simple recessive with bulls. Both parents have to carry the gene for it to show up visually. So the clutch from the original cross would look "normal" with a 66% chance of having the hypo gene. Obviously he picked two that did indeed have it. So theoretically 1 out of 4 should be hypo. If you "roll the dice" on those odds, you could produce many normal babies before hitting the one hypo, or you might luck out at times and get above the expected out come. It's just the difference of theoretical (what SHOULD happen) and experimental (what DOES happen) probability. Take a die and roll it 6 times, and see how many times you come up with a certain desired number.

As far as the color difference... Hypos are highly variable, and go through drastic color transformations from hatching until adult hood. My two are one year,and a 2013 model, and both don't look like the same snakes I first bought. They are awsome creatures though.

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