RECO Anerythristhic


Species: ball python

Name of Gene: RECO Anerythristic

First produced by whom: Engel Reptiles

Year: 2011

Genetics Type (Incdom/Codom/Recessive/Polygenic/etc):
codom and recessive (codom in males, recessive in females)

In complex with other genes?:

Other names/aliases for it?: RECO (for REcessive/COdominant) Anery


Appearance: Looks a lot like axanthic, deletes the reddish tones

Proven: 100 % proven out, as a single gene and in combos

Unique: When pairing a RECO Anery to an other morph, you can get visual RECO Anerys which are all males. All the females from this clutch are het RECO Anery while the other non visual males are non recessive. That’s absolutely unique and all proven out.

Related Genes:

Other History: Any additional history? the full description can be found here:

References here on the community: none since they never made a big deal out of it even though it is one.

Our worldsfirst RECO Anery Pewter from 2020:

RECO Anery single gene:

RECO Anery Clown:

RECO Anery Piebald:


Speaking with my geneticist hat on here:

  1. There is no erythrin pigment in ball pythons, ergo, there can be no anerythristic morphs. The only two pigments in ball pythons are melanin and xanthin.

  2. The inheritance pattern for this would be classified as ‘sex-linked recessive’. The mutation is recessive, as observed in females that are heterozygous being non-visual while females that are homozygous are visual. The males appear as visuals because there is no second allele to counter the effect of the mutation. If these reported results are accurate, it would appear there is a small region of difference between the X and Y chromosomes in ball python chromosomes would seem to not carry some subset of genes.


Shhhhh they can believe.

This is fascinating. What does this mean exactly, that the X chromosomes are larger and there is no corresponding Y allele?

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This is brilliant! :rofl:

Has any pairings with any of the existing lines of Axanthic been done to prove compatibility?

If it is sex linked recessive then this is definitely something fun to add to the hobby, I see lots of punnet squares in the future :wink:


Pairing a male with our Axanthic TSK female is our plan for the next season.
I don’t know if this has already been done :woman_shrugging:t2:

I can only say what the description from says and that all RECOs are definitely interesting looking animals :wink:
in my opinion at least.

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We know from karyotyping that the X and Y are basically isomorphic. Again, assuming what is being reported her is accurate, the implication would be that there is a small region absent from the Y chromosome that holds this gene but that the region is too small to affect the perceived size of the chromosome

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So it would, in fact, be impossible to have a Super male. If I’m getting this right, a visual male with technically one set of the gene or heterozygous to a homozygous visual female will result in visual males and visual females. A normal male to visual female will result in all hets with the males being visual (easy to sex!)

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Nope. No SuperMale possible

Imagine it like this: Two pieces of string, one is one hundred centimeters long (Y chromosome) and the other is one hundred five centimeters long (X chromosome) and you are looking at them from a hot air balloon fifty meters in the air.

From your perspective, the two strings are going to look like they are the same length (karyotype). On the genetic level however, that extra five centimeters on the longer string is where the gene is held. Since the Y chromosome will never have that extra five centimeters, there can never be two copies of the gene