Axolotl Morph Genetics Calculator
Axolotl colouration is controlled by a handful of well-documented genes, each inherited independently. Pick each parent’s morph below to estimate what their offspring are likely to look like — see Different Types of Axolotls: Morphs and Colour if you need a refresher on what each morph actually looks like.
Parent 1
Parent 2
This is an educational estimate, not a breeding guarantee. Unless you tick "I know this parent's lineage," it assumes each parent is genetically "pure" for their visible morph — real breeding pairs can carry hidden recessive genes ("hets") that don't show in their own appearance but can still show up in offspring. Morph sub-types within the albino family (white/golden/copper) are grouped together here, since the exact shade depends on modifier genes beyond this simplified model.
Which Morphs This Calculator Covers
This tool is built specifically around axolotl colour genetics that are well-documented as simple, single-gene dominant/recessive traits: Wild Type, Leucistic, Albino (including the White, Golden, and Copper family), Melanoid, and Axanthic, plus GFP as an independent dominant trait layered on top of any of them. These are the morphs real breeders can reliably select for, generation after generation.
A number of other morphs you’ll see in the hobby are deliberately left out, for three different reasons:
- Lab-produced, not naturally inherited: FireFly axolotls aren’t a heritable colour gene at all — per our morphs guide, they were physically created via embryonic grafting by a single breeder. You can’t breed two axolotls and reliably get FireFly offspring the way you can with two albinos.
- Developmental accidents, not predictable from either parent: Chimera and Mosaic axolotls result from sporadic events during embryonic development (two embryos fusing, or a genetic mosaic event) — not from any gene either parent carries. A perfectly ordinary-looking pair can occasionally produce one; there’s no way to breed toward it on purpose.
- Real, but not yet mapped to a simple gene: Piebald, Enigma, and Silver Dalmatian/Lavender all appear to be genuinely heritable, but the hobbyist community hasn’t documented them as clean single-gene traits the way albino or melanoid are. Modelling them here with any precision would mean guessing rather than real genetics — so we’ve left them out rather than give you a false sense of accuracy.
How Axolotl Colour Genetics Work
How Axolotl Colour Genetics Work
Axolotl colouration is controlled by at least four separate genes, each with a dominant “wild type” version and a recessive “morph” version. A recessive trait only shows up in an axolotl’s appearance if it inherits the recessive version from both parents — one copy just makes it a hidden carrier.
- Albino — recessive; affects melanin production, producing the White Albino, Golden Albino, and Copper family of morphs depending on modifier genes
- Melanoid — recessive; removes iridophores, producing a solid, matte dark colour with no golden shimmer
- Axanthic — recessive; removes yellow/gold pigment, producing a grey tone
- Leucistic — recessive; affects pigment cell migration during development, producing the white/pink leucistic look
Because these four genes are inherited independently of each other, an axolotl can carry hidden copies of several recessive genes at once without showing any of them — which is exactly how “surprise” morphs can show up in a litter from two wild-type-looking parents.
GFP (Green Fluorescent Protein) works differently — it’s a single dominant gene, not a colour morph, and can be layered on top of any of the morphs above. If a parent glows under UV light, it very likely carries one copy of the GFP gene, which it can pass on independently of colour.
Frequently Asked Questions
If both parents are wild type, can they still produce morphs?
Yes, if either parent is a hidden carrier (“het”) for a recessive gene without showing it. This calculator assumes visible parents are genetically pure for display purposes, but real animals can carry hidden recessive genes from earlier generations — which this tool can’t detect from appearance alone.
What happens if I cross two different morphs, like Albino and Melanoid?
Since albino and melanoid are controlled by separate genes, crossing a pure albino with a pure melanoid typically produces offspring that look wild type, but that all carry one hidden copy of each gene. Breeding two of those offspring together could then produce albino, melanoid, or even double-recessive combinations in the next generation.
Can GFP be combined with any morph?
Yes — GFP is inherited independently of colour, so it can appear alongside wild type, leucistic, albino, melanoid, or axanthic axolotls. A “GFP Leucistic,” for example, looks like a normal leucistic axolotl under regular light, but glows green under UV.
Why can't I select FireFly, Chimera, or Piebald in the calculator?
Each is left out for a different reason. FireFly isn’t inherited at all — it’s created through embryonic grafting by a single breeder, not passed down through breeding. Chimera and Mosaic are random developmental accidents that can occur in any pairing, regardless of either parent’s own colour. Piebald, Enigma, and Silver Dalmatian/Lavender do appear to be genuinely heritable, but they haven’t been mapped to a single, well-documented gene the way albino or melanoid have — so predicting them with any real accuracy isn’t currently possible.
What about genes from grandparents or earlier generations?
If you know a parent’s own mother or father, tick “I know this parent’s lineage” for that parent and select what that grandparent showed — the calculator will treat the parent as a confirmed carrier of that trait, even if the parent itself looks normal, which changes the real odds. Beyond the grandparent level, or if you don’t know a parent’s lineage, this tool can’t account for genes further back — the odds shown assume no other hidden carriers beyond what you’ve told it.
