Leopard Gecko Morph Calculator

Curious about the potential offspring from your leopard gecko pairing? Select the known genetic traits of each parent below to predict the possible morphs and their probabilities. This calculator uses basic Mendelian genetics.

Select parent genetics and click “Calculate Morphs”

Parent 1 Genetics
Albino Strain:
Mack Snow Gene:
Eclipse Gene:
Blizzard Gene:
Murphy Patternless Gene:
Parent 2 Genetics
Albino Strain:
Mack Snow Gene:
Eclipse Gene:
Blizzard Gene:
Murphy Patternless Gene:
Note: “Het” means heterozygous, carrying one copy of a recessive gene. “Visual” means the trait is expressed.

Understanding Leopard Gecko Genetics

Leopard gecko genetics can be fascinating! Morphs (color and pattern variations) are determined by genes. Some key concepts:

• Recessive Genes: An animal needs two copies of a recessive gene (one from each parent) for the trait to be visually expressed. If it has only one copy, it’s “heterozygous” (het) for that trait and carries it without showing it. Examples: Albino, Eclipse, Blizzard, Murphy Patternless.
• Incomplete Dominant Genes: A single copy of the gene results in a visual trait (e.g., Mack Snow). Two copies result in a “super” form (e.g., Super Mack Snow, often called Super Snow).
• Dominant Genes: A single copy of the gene results in a visual trait. The “super” form (if one exists) may look the same or different. (Not heavily featured in this basic calculator).
• Polygenic Traits: Traits influenced by multiple genes, like tangerine intensity or hypo melanism (reduced black spotting). These are complex and not easily predicted by simple Punnett squares, so they are not included here.
• Albino Strains: There are three main albino strains (Tremper, Bell, Rainwater). They are not compatible, meaning a Tremper Albino bred to a Bell Albino will produce normal-looking offspring that are double het for both albino types (het Tremper, het Bell).

This calculator uses Punnett squares to determine the probability of different genetic combinations in the offspring. For each gene you select, it considers the genetic contribution from each parent.

How to Use This Calculator

1. For Parent 1, select the known genetic traits from the dropdown menus. If a parent is normal for a gene or its genetics for that trait are unknown, select “Normal”.
2. Repeat for Parent 2.
3. Click the “Calculate Morphs” button.
4. The results will show a list of possible offspring morphs and their percentage chance of occurring from that pairing.

Important: This is an educational tool providing theoretical probabilities. Actual breeding outcomes can vary due to chance. Complex interactions between genes (epistasis) or new mutations are not accounted for. Always consult with experienced breeders for specific advice.

Leopard Gecko Resources

Leopard Gecko Wiki – Morphs LeopardGecko.com – Morphs & Genetics GeckoBoa Genetics Calculator (Advanced)