Pick what each parent carries and see every hatchling the pairing can produce, with the odds for each. Free, no signup, and it covers all 28 proven corn snake genes.
Corn snakes are a recessive species — 21 of the 29 proven genes hide in carriers rather than showing. That makes hets the whole game, so the odds that matter most here are the ones you can't see in the animal.
♂ Male
TRAITS CARRIED
Nothing selected — treated as a normal.
HYPO COMPLEX
MOTLEY COMPLEX
SCALELESS COMPLEX
ULTRAMEL COMPLEX
INCOMPLETE DOMINANT
RECESSIVE
DOMINANT
♀ Female
TRAITS CARRIED
Nothing selected — treated as a normal.
HYPO COMPLEX
MOTLEY COMPLEX
SCALELESS COMPLEX
ULTRAMEL COMPLEX
INCOMPLETE DOMINANT
RECESSIVE
DOMINANT
Predicted offspring
Add traits to one or both parents to see the odds.
Keep the pairing instead of re-typing it
My Reptile Atlas saves this against the two animals, then tracks the clutch through incubation and shows you how the real hatchlings compared to these odds. Free for up to 20 animals.
Amelanistic and Ultra share a locus, so one copy of each isn't a het — it's an Ultramel, a morph in its own right. The calculator names it rather than reporting two carriers.
Four allelic complexes in all: Ultramel, Hypo (with Christmas and Strawberry), Motley (with Stripe) and Scaleless (with Microscale). Genes inside a complex can't stack the way unrelated ones do.
Most of this species is recessive, so a normal-looking snake can carry almost anything. The het rows below are the useful ones — they're what tells you whether a pairing is worth making next season rather than this one.
Stargazer carries neurological issues and Lavender is recorded with kinking. Palmetto has an increased likelihood of enlarged eyes. All three are flagged in the results.
Morphpedia lists Cinder as suspected sex linked, so its trait odds hold but the sex split doesn't.
Ultramel is a special case.Amelanistic and Ultra share a locus, so one copy of each doesn't give you a normal-looking het — it gives you an Ultramel, which is its own morph. The calculator names it rather than reporting the pair.
Cinder is a special case.Morphpedia records Cinder as suspected sex linked. The trait odds here are right, but the sex split isn't something a Punnett square over ordinary genes can predict.
The genes it covers
Every trait MorphMarket Morphpedia lists as recessive, incomplete dominant or dominant, grouped by how it inherits.
Any two of these together make a Ultramel, and an animal can carry at most two.
AmelanisticUltra
HYPO COMPLEX — ONE LOCUS, 3 ALLELES
These share a locus, so an animal carries at most two of them and never all three.
HypomelanisticChristmasStrawberry
MOTLEY COMPLEX — ONE LOCUS, 2 ALLELES
These share a locus, so an animal carries at most two of them and never all three.
MotleyStripe
SCALELESS COMPLEX — ONE LOCUS, 2 ALLELES
These share a locus, so an animal carries at most two of them and never all three.
ScalelessMicroscale
Localities
A locality is a place, not a look. It says which wild population a line descends from, and it passes down by pedigree rather than by any gene — which is why it can only be proved with records, and why a crossed line can never be uncrossed.
Miami
Traits no calculator can predict
MorphMarket Morphpedia classes these as polygenic or structural. They're real traits and they set prices, but they don't sit on a single gene, so no Punnett square predicts them. Anything quoting you a percentage for harlequin or flame is guessing.
GraniteSunglow line
What does work for these is records: pair the same two animals for a few seasons and your own hatch data tells you far more than any average could. That's what My Reptile Atlas is for.