Circles indicate females, squares indicate males.
Solid symbols indicate dogs that have bloated.
Analysis of the pedigree When attempting to establish the mode of inheritance from a pedigree, the objective should be to come up with the simplest model that will explain the data . Therefore, we should first ask whether bloat can be explained as a single-gene dominant or recessive trait. We also have to suppose that every non-bloating individual that has an affected son or daughter is a carrier. There are nine of them, only two of which are known to have a parent that bloated. A and D are from two normal parents.