Rabbit Color Calculator
Parent Genotypes
Offspring Probabilities
Punnett Square
Each cell represents a 25% probability.Probabilities apply to each offspring, not a guaranteed litter ratio.
Genotype & Color-Base Breakdown
| Genotype | Probability | Color Base | Chocolate Carrier |
|---|
Color-base categories sum to 100%. Carrier status overlaps with black base.
Inheritance Explained
B is dominant to b. Each parent contributes one allele.
BB: two B alleles • Bb: one B and one b • bb: two b alleles.
BB × Bb → 50% BB + 50% Bb
Visible black/chocolate examples assume a solid, dense, full-color background. A, C, D and E loci can change or mask the appearance. Rabbit illustrations show this assumed background.
Frequently Asked Questions
Can two black rabbits produce chocolate offspring?
Yes, if both carry b. Bb × Bb gives 25% BB, 50% Bb and 25% bb per offspring at this locus. Other coat-color genes affect visible appearance.
Why can’t I infer genotype from appearance alone?
BB and Bb can both have a black color base. A rabbit’s visible appearance alone generally cannot distinguish these two B-locus genotypes; reliable breeding records or genetic evidence are needed.
Which other genes affect coat color?
A affects pattern, C affects pigment expression, D affects dilution and E affects extension of pigment; spotting and silvering also matter. For example, dd can change black base to blue and chocolate base to lilac. This tool models only B.
What does this calculator calculate?
Offspring B-locus genotype probabilities from BB, Bb or bb parents, plus black versus chocolate base probabilities and heterozygous carrier status.
Which values and formula should I use?
Select each parent’s known B-locus genotype. Each parent supplies either of its two alleles with probability 1/2. The four ordered combinations each have probability 1/4; matching genotypes are added.
Why might results differ from another calculator?
Tools may model multiple loci or use different assumptions about unknown genotypes. This model uses only known B-locus genotypes and does not infer them from coat appearance.
Does the result update automatically?
Yes. Both parent menus, quick crosses, swap and reset update the Punnett square, probabilities, illustrations and explanation.
Will a litter match these percentages?
Not necessarily. These are probabilities for each offspring. Small litters may differ substantially from the expected proportions.
Rabbit Color Calculator Predict the probability of coat color outcomes in rabbit offspring using basic Mendelian genetics for the black (B/b) locus. — free online calculator.