Reptile Morph Genetics Tracking: Dominant, Recessive, and Codominant Records

Genetics tracking is the intellectual core of reptile breeding. An animal is only worth what you know about it genetically. A ball python sold as "possible het clown" is worth a fraction of one sold as "proven het clown from clown x het clown pairing, 5 of 5 clowns produced." The difference is records.

Dominant Morphs

Dominant traits like Spider, Pinstripe, Pastel, and Lesser display visually in every animal that carries a single copy of the gene. There are no hidden carriers. If your animal shows the trait, it has the gene. Documentation for dominant morphs focuses on visual identification and lineage. Record the morph name, the parent each copy came from, and the visual appearance of the specific animal.

Dominant supers (homozygous animals like Super Pastel or Super Mojave) are produced when two copies of the same dominant gene are present. Document which animals produced the breeding that yielded a super-visual, as this confirms both parents carried the gene.

Recessive Morphs

Recessive morphs are where record keeping earns its value. Recessives like Clown, Pied, Albino, and Desert Ghost only display visually when an animal carries two copies of the gene. Single-copy carriers (hets) look completely normal and cannot be identified visually.

Track het status with the source of the het and the level of probability. A "100% het" means both parents were visual or confirmed carriers. A "66% possible het" means the animal came from a pairing where one parent was visual and one was wild type, and survived the statistical cut without a definitive genetic test.

Proven het status is established by producing visual offspring. Document each clutch that produced visuals from a het animal, including the pairing, the number of offspring, and how many were visual. Once proven, that animal's het status is no longer probabilistic.

Codominant Morphs

Codominants like Spider, Enchi, Mojave, and Lesser express visually as single-copy hets and produce a distinct super form when homozygous. They are always visually identifiable and always pass the gene to 50% of offspring, so tracking is simpler than with recessives.

For codominants, focus your records on the specific visual appearance of each animal (since expression varies between individuals), which morph combinations are stacked together, and the breeding outcomes when two codominants are paired.

Combo Morph Records

Combo morphs are where most of the value in ball pythons lives. A Banana Clown looks dramatically different from either a plain Banana or a plain Clown, and is worth substantially more. Document every genetic component present in each animal, not just the obvious visual ones.

When producing a new combo, record the expected offspring probabilities before the clutch hatches, then compare them to what actually came out. Over many clutches, this comparison tells you if your genetic assumptions are correct and catches mis-identified morphs before they become expensive mistakes in a future breeding project.

Genetic Testing

For recessives where visual confirmation is not possible, genetic testing services like NERD, Morph Wizard, and VPI genetics can establish het status with certainty. When you receive test results, log them with the test date, the testing company, and the result. Genetic test documentation increases an animal's value and protects buyers downstream.