Figure 5.11

Figure 5.11: Coat color in dogs is determined by interactions between genes at a number of loci. (a) Most Labrador retrievers are genotype A^SA^S SS, varying only at the B and E loci. (b) Most beagles are genotype a^sa^s BB s^Ps^P. (c) Dalmatians are genotype A^SA^S EEs^ws^w, varying at the B locus, which makes the dogs black (B_) or brown (bb).

[Part a: imagebroker/Alamy. Part b: RFcompany/age fotostock. Part c: PhotoDisc.]