Figure 1.

A realization of the ancestor-copying process. In this case, the process stays in the interval $\left[0,\frac{1}{2}\right)$, indicating that this length of chromosome was inherited entirely from the proband’s left parent. The process jumps between $\left[0,\frac{1}{4}\right)$ and $\left[\frac{1}{4},\frac{1}{2}\right)$ three times, indicating that each left grandparent contributed two blocks to the proband. The pedigree, up to the proband’s eight great-grandparents, is shown on the right. Each ancestor has been placed in its corresponding dyadic interval.