Free tool — no account needed

African fat-tailed gecko morph calculator

Hemitheconyx caudicinctus — The fat-tail catalogue is overwhelmingly recessive, so het tracking is the whole game. Whiteout is the notable incomplete dominant, with a distinctive super form.

Change species

Sire ♂

1 gene

Whiteout

Incomplete dominant

Dam ♀

1 gene

Whiteout

Incomplete dominant

Clutch odds per egg

2 possible hatchlings · updates live

Left out of the percentages because they are polygenic or line-bred — log them on the animal instead: Tangerine intensity, Wide-band, Aberrant patterning.

Email me these odds

Get this pairing in your inbox and keep it saved in a free account.

Free account, no password or card. The tool stays free either way.

Learn before you pair

Questions keepers ask

Are predicted morph percentages guaranteed in a clutch?
No. Each percentage is a probability for an individual egg. A small clutch can differ substantially from the expected ratio.
Can a photograph prove a recessive het?
No. Record documented parentage, breeding evidence or appropriate genetic testing separately from visual appearance. A possible het remains a probability, not a proven carrier.
Can line-bred traits be predicted with a Punnett square?
Not reliably. Line-bred and polygenic traits involve selection and multiple influences; keep their descriptions in animal records rather than treating them as simple single-gene odds.

Other species