Ball Python Morph Genetics: Incomplete Dominant vs Recessive Traits Explained

When planning Ball Python breeding projects, understanding inheritance patterns is essential to calculating clutch odds and accurately listing hatchling genetics.

Here is a straightforward reference guide on how incomplete dominant and recessive mutations function.

1. Incomplete Dominant (Co-Dominant) Traits With incomplete dominant mutations, just one copy of the mutant gene changes how the snake visually appears (heterozygous), and two copies create a transformed 'super' form (homozygous):

• Pastel: Single copy enhances yellows and head blushing; homozygous produces the high-contrast Super Pastel.
• Banana / Coral Glow: Produces bright yellow and orange coloration with black peppering as the snake matures.
• Mojave & Lesser / Butter: Members of the Blue-Eyed Leucistic complex. Pairing Mojave to Mojave or Mojave to Lesser produces a solid white BEL snake with blue eyes.
• Enchi: Acts as a pattern reducer and color enhancer, sharpening teardrops and contrast in complex combos like Clown.

2. Recessive Traits Recessive mutations require a copy of the mutant allele from both sire and dam to express visually. If an animal receives only one copy, it appears normal but carries the mutation (100% Het):

• Clown: Distinct teardrop head markings and reduced dorsal pattern.
• Piebald (Pied): Unpredictable clean white patches across sections of the body.
• Desert Ghost (DG): Clean yellow and grey hues that resist fading or browning as the animal matures into adulthood.
• Axanthic: Suppresses red and yellow pigments, producing a stark monochrome black and silver contrast.

Pairing Odds Reference:

• Visual Recessive × Visual Recessive = 100% Visual hatchlings
• Visual Recessive × Normal = 100% 100% Het hatchlings
• Het × Het = 25% Visual, 50% 66% Possible Het, 25% Normal