Dominant and recessive traits

A dominant gene can show with one copy. A recessive gene, such as Axanthic, needs two copies to show; one copy can travel through a family unseen. With an incomplete dominant gene, one copy and two copies can make different looks. The two-copy look is sometimes called a super.

For a simple dominant example, a Black Base gecko with one B copy paired with a gecko without B gives each egg a 50% chance to inherit B and show black. With incomplete dominant Dalmatian, two one-copy parents give each egg a 25% chance of the two-copy Super Dalmatian look, a 50% chance of one copy, and a 25% chance of neither copy. These odds belong to each egg, not to a fixed number of hatchlings in a clutch.

Two copies are not always safe. For example, two Lilly Whites cannot be paired because a hatchling with two copies would not survive. That pairing would give each egg a 25% chance of the lethal two-copy form, so the game refuses it. Read the Lilly White library sheet for its appearance and caution. In Pairing, choose a female and then a male to read the preview. It shows possible two-copy forms and stops a pairing with a lethal or severe risk. Check that warning before planning a line. For a recessive example, follow how genes pass down.