Rabbit Color Calculator

Biology

Predict the probability of coat color outcomes in rabbit offspring using basic Mendelian genetics for the black (B/b) locus.

Formula

Punnett square: 4 allele combinations from two parents
  • B (dominant) = black coloration; b (recessive) = chocolate coloration.
  • Only the B locus is modeled here. Actual coat color depends on multiple loci (A, C, D, E).
  • BB × Bb gives 50% BB (black) and 50% Bb (black carrying chocolate).

Bb × Bb cross

Inputs
  • Parent 1 Genotype (B locus): Bb
  • Parent 2 Genotype (B locus): Bb

Punnett square gives: 25% BB (black), 50% Bb (black/carrier), 25% bb (chocolate).

Frequently asked questions

Why does my black rabbit have chocolate babies?
If both parents carry the recessive b allele (Bb), there is a 25% chance of chocolate (bb) offspring.
What other loci affect rabbit color?
The A, C, D, and E loci also control pattern, dilution, and extension. This calculator covers only the B locus.