Corn Snake

Line trait producing irregular white blotches along the flanks. Modern hobby consensus (Soderberg, European cornsnake community since ~2015) treats it as incomplete dominant — visual × normal yields ~50% Pied-Sided offspring. Earlier sources classified it as polygenic-with-threshold. Variable expressivity is real: the calculator predicts genotype, not the precise visual extent. Disputed-inheritance flag keeps imports tolerant of legacy 'het Pied-Sided' labels.

Co-dominant pattern trait. Visual Tessera × Normal produces ~50% Tessera; Super Tessera (homozygous) is a distinct phenotype with full striping and reduced lateral pattern. Some early references list Tessera as 'dominant'; the codominant classification matches current breeder consensus.

Allelic with Ultra at the Amel locus. Amelanistic × Ultra produces visual Ultramel (the compound heterozygote, see the Ultramel entry below) rather than double-het. The catalog keeps both alleles as separate trait rows for clarity; the allelic relationship is documented but not enforced by the calculator engine.

Hypomelanistic-leaning allele at the Amel locus — allelic with Amelanistic, not independent. Ultra × Amelanistic produces visual Ultramel (compound heterozygote, see below). Homozygous Ultra (u/u) is a distinct visual class: residual pattern with reduced black, less stark than full Amel. The allelic relationship is well-established in the hobby (Don Soderberg / European corn snake community) but not enforced by the calculator engine — the catalog ships them as separate trait rows for clarity.

Type I anerythristic (the original Anery line). Distinct from Charcoal, which is Anery B at a separate locus — they are NOT the same gene; Anerythristic × Charcoal offspring are double-het, not visual.

Some breeders argue Caramel, Toffee, and Sulfur are allelic at the same locus. The catalog keeps them as separate trait rows pending consensus — pairings between them may produce compound visuals, not double-het.

Reportedly allelic with Caramel and Sulfur at the same locus. The catalog keeps them separate pending consensus — record observed compound visuals if you pair them.

Reportedly allelic with Caramel and Toffee at the same locus. The catalog keeps them separate pending consensus — record observed compound visuals if you pair them.

Some breeders argue Bloodred ≡ Diffused (same locus). The catalog keeps them as separate trait rows pending consensus.

Type II anerythristic locus, hobby-named 'Charcoal'. Distinct from regular Anerythristic (Anery A) — different gene; Charcoal × Anerythristic offspring are double-het, not visual.

Third anerythristic locus, separate from Anery A and Charcoal (Anery B). Anery C × Anery A or Anery C × Charcoal offspring are double-het, not visual.

Some breeders argue Diffused ≡ Bloodred (same locus). The catalog keeps them as separate trait rows pending consensus.

The original (Hypo A) hypomelanistic recessive. Multiple distinct hypomelanistic lines exist at different loci — Lava, Christmas, Sunkissed, Ultra — and are NOT interchangeable for breeding. Pairings between different hypo lines produce double-het animals, not visual.

Hypomelanistic-line recessive at its own locus, distinct from Hypo A and Christmas. Intense red base with purple-grey reduced black. Lava × other hypo lines produce double-het, not visual.

Hypomelanistic-line recessive at its own locus, sometimes described as 'leaky' Hypo (some melanin retained). Distinct from Hypo A, Lava, and Sunkissed — pairings between them produce double-het.

Hypomelanistic-line recessive at a separate locus from the other hypo lines. Sunkissed × any other hypo offspring are double-het, not visual.

Pattern recessive producing swirled, disrupted saddle pattern.

Head pattern recessive — produces a distinctive face/mask appearance.

Pattern recessive producing irregular tile-like fragmented saddles.

Selectively-bred line with silver-grey ground and strong red saddles. Polygenic — outcomes vary by lineage.

Selectively-bred line that intensifies red pigment. Not a single-gene trait — outcomes vary by lineage and pairing.

Hobby-described recessive from a small founder line. Outcrossed data is limited — inheritance not confidently confirmed. Recorded as unknown until more pairings clarify it.

Pattern morph debated in the hobby — some breeders treat it as a Motley-line expression, others as a polygenic modifier. Recorded as unknown until consensus settles.

Visual compound of Amelanistic + Anerythristic — multi-locus. Calculator emits 'outcomes vary' rather than fake single-locus predictions.

Compound heterozygote at the Amel locus — animal carries one Amelanistic allele (a) and one Ultra allele (u), producing the Ultramel phenotype (intermediate between Amel and Ultra). Visually distinct from both parents. NOT a multi-locus combo: a/u is a single locus with two non-wildtype alleles interacting codominantly. Calculator emits 'outcomes vary' for pairings — see Amelanistic and Ultra notes for the allelic relationship.