Amelanistic
recessive · OCA2
Ultra/Ultramel are excluded; this model covers only the documented Amelanistic allele.
Saenko et al. (2015): Amelanism and OCA2 ↗
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KeeperOS genetics lab · Pantherophis guttatus
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Each parent passes one of its two alleles at each locus. A recessive carrier has one variant and one wild-type allele. Two variant copies can produce the modeled trait. Tessera is dominant: one or two copies can produce Tessera, with no reliable visual distinction between those genotypes.
Both are recessive to wild type at CLCN2. One Motley allele with one Stripe allele is a compound genotype with variable pattern. It is kept distinct from homozygous Motley and homozygous Stripe, even where older calculators group their appearances.
Snow labels the homozygous Amelanistic + Anerythristic combination; it is not a separate gene. Other results retain component names. Traits may mask each other. Exact colour, pattern, fertility, health and survival are not calculated, and appearance cannot establish a parent's genotype.
Unselected modeled loci are assumed wild type only for this hypothetical pairing. Unknown animal records are not evidence of wild type. Different loci assort independently in this model; a complete linkage map is not established. Lava is excluded, including Charcoal/Lava predictions. Use at most six active loci across both parents, with up to 972 complete genotype outcomes.
Scope & evidence
Nine ordinary recessive traits, two recessive alleles at a shared pattern locus, and one dominant trait. Molecular evidence and breeder documentation are distinguished below. Source-checked for this version; not reviewed by a human genetics expert.
recessive · OCA2
Ultra/Ultramel are excluded; this model covers only the documented Amelanistic allele.
Saenko et al. (2015): Amelanism and OCA2 ↗recessive · ANERY-A
Anery A only. Charcoal is a separate breeding-model locus, not an alias.
South Mountain Reptiles: base-morph inheritance ↗Martin Schmidt: Corn Snake Genetics Primer (1999) ↗recessive · CHARCOAL
No molecular gene assigned. Lava is excluded because of reported linkage concerns.
South Mountain Reptiles: base-morph inheritance ↗recessive · CARAMEL
Breeding model; yellow intensity and possible subtle carrier effects are not predictions.
South Mountain Reptiles: base-morph inheritance ↗recessive · HYPO-A
Standard Hypo A only; Strawberry, Christmas, Lava and Ultra are excluded.
South Mountain Reptiles: base-morph inheritance ↗recessive · LYST
No precise colour, organ function or health-risk prediction.
Ullate-Agote et al. (2020): Lavender and LYST ↗allelic series · CLCN2
Recessive to wild type. Shares its locus with Stripe; compounds have variable appearance.
Montandon et al. (2025): Motley/Stripe and CLCN2 ↗allelic series · CLCN2
Confirmed Stripe allele, not any striped-looking snake. No health or survival odds.
Montandon et al. (2025): Motley/Stripe and CLCN2 ↗recessive · DIFFUSED
Bloodred is not accepted as a synonym for a confirmed Diffused genotype; Masque and selected colour are separate.
South Mountain Reptiles: base-morph inheritance ↗recessive · SUNKISSED
Not Hypo A. Subtle carrier effects do not diagnose genotype; Stargazer is not inferred.
Don Soderberg: Sunkissed Mutation ↗recessive · CINDER
Breeding-based recessive model; resemblance to other grey morphs does not establish this genotype.
South Mountain Reptiles: base-morph inheritance ↗dominant · TESSERA
One and two copies can look alike. Two copies require confirmed genetics, not a claimed visual Super form.
Don Soderberg: History of the Tessera Mutation ↗Ultra/Ultramel, Lava (including Charcoal/Lava linked predictions), Strawberry, Christmas, Masque, Pied-sided, Stargazer, Palmetto, Scaleless, Terrazzo, hybrids, possible-het parents, and line-bred labels such as Okeetee, Miami and Hurricane. Snow is an output combination label, not a selectable gene.
Line-bred colour and health-associated predictions need different evidence. Possible-het parent percentages are not accepted as confirmed genotypes.
OCA2, LYST and CLCN2 are molecular assignments. Other locus labels are breeding-model identifiers, not invented gene names. Read the Motley/Stripe research ↗