Breeding two animals that both look normal: how likely is a rare-trait offspring?

Some traits skip a generation and show up only when both parents secretly carry them, so the odds depend on how common the trait is in the herd and not only on the parents' looks. This shows how to work out the chance for random pairs and for known parents.

Why this works

A hidden trait can sit unseen in healthy-looking animals, so what shows on the outside is not what is passed on. The odds follow from what each parent may carry, and in a herd that depends on how common the trait is among all animals, not only those that show it.

When not to use it

Skip it when the trait is influenced by many things at once, like size or speed, or when the environment matters as much as the parents. This simple two-copy rule fits a single yes or no trait, nothing blended.

In the full entry

• What to build, step by step
• Starting values and the reason for each
• 3 common mistakes and the fix
• 43 lines of example code with 5 checks that pass
• How your AI shows you that it works

Say this to your AI

Use the Spielerando entry "Breeding two animals that both look normal: how likely is a rare-trait offspring?" (read_entry hidden-carrier-breeding-chance) in my game. Build it step by step, and show me how you checked that it works.

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