Ball Python morph
Ball Python (Python regius)
Visual MJ Axanthic. Homozygous at MJ axanthic locus. Grayscale coloration.
Reduces yellow/red pigment. MJ line established by Markus Jayne in 2008. The newest of the four confirmed axanthic lines. Proven independent from VPI, TSK, and Jolliff lines through complementation testing.
How to identify it: Grayscale appearance. Visually similar to other axanthic lines. Lineage tracking required to distinguish from other lines.
MJ Axanthic follows a recessive inheritance pattern, carried on the Axanthic (Markus Jayne Line) allele (locus AxMJ).
Because MJ Axanthic is recessive, an animal needs two copies of the allele to show the trait visually. An animal with a single copy is called het mj axanthic (heterozygous). A het animal looks normal but carries the gene, so pairing two het mj axanthic animals produces, on average, one in four visual mj axanthic offspring.
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