Phylogenetic tree that shows a possible clonal evolutionary history for the sequences p, q, and c. Mutations occurring in branch 1 will result in an informative site of type Q, while mutations occurring in branch 2 will result in an informative site of type P. The distributions describing the probability that the mutations in branch 1 or 2 cluster on either side of a breakpoint or between some pair of breakpoints are those of Δm,n,1 and Δm,n,2.