Rat Genetics tools: what they help with
These calculators predict the likely colors, patterns or morphs from a rat pairing, using the known inheritance of each trait. Understanding genetics helps breeders avoid pairings linked to health problems and set realistic expectations about offspring.
What to know about genetics and morphs for rats
Rats typically live 2 to 3 years. Rats are intensely social and must be kept in same-sex pairs or groups. They need a tall wire cage with solid levels, daily out-of-cage time, and constant novelty since they bore quickly.
Rat quick facts
| Measure | Rat |
|---|---|
| Typical lifespan | 2–3 years |
| Adult weight | 0.6–1.3 lb (0.3–0.6 kg) |
| Diet | Omnivore |
| Mature at | About 3 months |
| Pregnancy | 21–23 days |
| Litter size | 6–12 |
| Humidity | 40–60% |
A practical tip
Results are probabilities across many offspring, not a guarantee for one litter or clutch. Hidden recessive genes can also surprise you.
Other rat topics
Most questions lead to another. You may also find these useful: rat age tools, rat behavior tools, rat breeding tools and rat cost tools. Or see every rat tool in one place.
Genetics tools for other pets
The same kind of tool exists for other species, each using that animal's own reference data: dog genetics, cat genetics, rabbit genetics and hamster genetics.