Lock & Lay

Recessive ball python gene

Monarch Ball Python: Genetics and Pairing Odds

Monarch is a recessive gene. A ball python needs two copies to look Monarch; with one copy it looks normal and is called het Monarch. Pair two hets and about a quarter of the babies are visual Monarch, while the normal-looking siblings are each 66% likely to be het. Breed a visual to a normal and every baby is het, which is how most Monarch projects start.

What Monarch pairings produce

PairingBabies, per egg
Monarch × Normal100% Normal het Monarch
Het Monarch × Het Monarch75% Normal 66% het Monarch25% Monarch
Monarch × Het Monarch50% Normal het Monarch50% Monarch
Monarch × Monarch100% Monarch
Het Monarch × Normal100% Normal 50% het Monarch

Try Monarch pairings yourself

Put any two animals into the ball python morph calculator for the full odds, hets and supers included. Or breed Monarch ball pythons in Lock and Lay, a free ball python game where every clutch follows these same odds and the babies sell on a live market.

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Other recessive genes

PuzzleCrypticEnhancerDesert GhostTri-StripeLavender AlbinoGenetic BandedPiebaldCandySaharaBlack AxanthicClown