Figure 2 .

A directed acyclic graph (DAG) describing the dependencies among model parameters and data. Solid arrows imply probabilistic links and dashed arrows deterministic relationships. The process that is assumed to have generated the genotype data (x) involves the ancestral allele frequencies (q), the amount of genetic drift experienced by the lineages (a), the allele frequencies in the lineages (z), and the lineage loadings, i.e., the contributions of lineages to the local populations (k). Derived parameters include allele frequencies in the subpopulations (p) and the matrix of population-level coancestry coefficients (θ^P) from which F_ST can be computed.