How this calculator works
At each locus each parent transmits one of two alleles with equal probability. The five core-locus probabilities are multiplied under independent assortment and grouped into descriptive colour models. Albino masks the other core colours. Steel, harlequin, shaded and dilution descriptions reflect the selected alleles, but breed names and exact shades also depend on modifiers. Optional spotting, Vienna, Dutch, silvering, wideband and lutino crosses are reported separately, so their percentages should not be added to the core table.
Formula
For each locus, four equally likely parental allele pairings are counted and identical genotypes are combined. Joint core probability = P(A) × P(B) × P(C) × P(D) × P(E). A colour-model probability sums its compatible core genotypes. All percentages describe possibilities for each offspring, not a guaranteed litter distribution.
Worked example
With all other core loci fixed to a full-colour self dense rabbit, B/b crossed with b/b gives 50% black-base and 50% chocolate-base offspring. Two B/b parents give 75% black-base and 25% chocolate-base. An en/en crossed with En/en gives separate spotting-genotype probabilities of 50% en/en and 50% En/en.
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Frequently asked questions
Can colour alone identify the parental genotype?
Usually not. A dominant-looking rabbit may carry recessive alleles. Use pedigree, test breeding information or a suitable genetic test to support explicit genotypes.
Will a litter contain the exact percentages?
No. The values are probabilities for each offspring. Small litters can differ greatly from the expected proportions.
Why are modifier probabilities in a separate table?
Combining every optional locus can create a very large table, and expression is not always simple dominance. Separate genotype probabilities preserve the inheritance arithmetic without claiming an exact whole-coat phenotype.