Boa Constrictor morphs and genetics
Live-bearing, long-lived, and built on co-dominant genes whose super forms are the point of most projects.
Working with boa constrictor genetics
Boas are a co-dominant species. Most established projects are built on genes that are visible in one copy and produce a distinct, more extreme super in two — so a pairing of two visual animals is still worth calculating, because a quarter of the litter is something different from either parent.
They are also live-bearing, which changes the record keeping: there is a gestation to track rather than an incubation, and no eggs to candle.
What makes this species different
IMG (Increasing Melanin Gene) is the one that catches people out — its super form looks so unlike the single-copy animal that it is frequently sold under a different name. Two separate albino lines, Sharp and Kahl, are non-allelic recessives, so crossing them produces double hets that look completely normal, exactly as in leopard geckos.
Every curated boa constrictor gene
Grouped by mode of inheritance. This is the dataset the HerpSync calculator runs on, published in full — the flags in the last column are what a standard Punnett square gets wrong.
Recessive (6)
Two copies to showNeeds a copy from each parent to be visible. One copy makes a het — an animal that looks normal and carries the gene.
- Anerythristic
No red pigment. Also called: Anery.
- Caramel
Caramel/yellow hypo recessive.
- Eclipse
Recessive pattern morph.
- Kahl Albino
T- albino strain; non-allelic with Sharp. Also called: T- Albino.
- Leopard
Broken pattern with spots.
- Sharp Albino
Tyrosinase-positive albino strain. Also called: Sharp Strain, T+ Albino.
Co-dominant (7)
One copy shows, two make a superOne copy changes the animal's appearance; two copies produce a distinct, usually more extreme super form with its own name.
- Arabesque
Super form: Super Arabesque
Increased dorsal pattern.
- Aztec
Super form: Super Aztec
Pattern-disrupting co-dom.
- Hypo
Super form: Super Hypo
Reduced melanin; super is much lighter. Also called: Salmon.
- IMG
Super form: Super IMG
Super IMG (Moonglow base) darkens with age. Also called: Increasing Melanin Gene.
- Jungle
Super form: Super Jungle
Aberrant pattern.
- Motley
Super form: Super Motley
Pattern reduction.
- Pastel
Super form: Super Pastel
Brightening co-dom.
Breeding and incubation
Gestation runs roughly 150 days and females are typically not bred before three years, with weight and body condition mattering more than the calendar. Litters are large enough, and the animals valuable enough, that per-animal cost tracking across a multi-year project is genuinely worth doing.
- Scientific name
- Boa constrictor
- Group
- Boas
- Reproduction
- Live-bearing
- Gestation
- ~150 days
- Maturity
- ~37 months
- Young are called
- Neonates in a litter
Timings are husbandry-typical approximations used for projections and reminders, not veterinary scheduling. Every figure can be adjusted per workspace.
Try a pairing
Pick genes for two boa constrictor parents and see the full odds — per gene and per combination — with no account and nothing to install.
Common questions
Can I breed a Sharp albino boa to a Kahl albino?
You can, but the offspring will not be albino. Sharp and Kahl are separate recessive genes at different loci, so the babies carry one copy of each and look normal. They are double hets, and they are only worth what a buyer will trust you on.
Do boa constrictors lay eggs?
No — boa constrictors are live-bearing, with a gestation of roughly 150 days. HerpSync knows this per species and tracks a gestation and a litter rather than an incubation and a clutch, including the right vocabulary on every screen.
Track your boa constrictors properly
Record genotypes per animal, predict clutches before you pair, and keep husbandry, pedigrees and sales in one place. Free for up to 10 animals.
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