Boa Constrictor morph calculator
Choose the genes each parent carries and see the full clutch odds — per gene and per combination. Covers 13 curated boa constrictor genes, with the allelic, lethal and sex-linked cases handled properly.
Sire (male)
Which genes the father carries, and in what form.
No genes yet — this parent is treated as a normal animal.
Dam (female)
Which genes the mother carries. Sex matters only for sex-linked genes.
No genes yet — this parent is treated as a normal animal.
Add at least one gene to a parent to see the predicted offspring.
Go deeper
The species page lists every curated boa constrictor gene with its mode of inheritance, super form and flags, alongside breeding and incubation notes.
Common questions
Is the boa constrictor morph calculator free?
Yes. No account, no sign-up, and no limit on how many pairings you try. Everything runs in your browser and nothing is stored.
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.
Run this against your own boa constrictors
Record genotypes on each animal and every prediction comes from real records — with pedigrees, inbreeding coefficients and what each clutch actually produced.
Get started free