We define the X-linked kinship coefficient ij between two relatives i and j as the probability that

We define the X-linked kinship coefficient Φij between two relatives i and j as the probability that a gene drawn randomly from an Xlinked locus of i is i.b.d. to a gene drawn randomly from the same X-linked locus of j. When i = j, sampling is done with replacement.

When either i or j is male, one necessarily selects the maternal gene.

Show how the algorithm of Section 5.2 can be modified to compute the X-linked kinship matrix Φ of a pedigree [11].