Average minor allele frequency (MAF) in P1 and P2 datasets is approximately half of that in the corresponding P1+P2 datasets (Table 1). In the Pistacia P1+P2 dataset derived from a single cross, almost all SNPs have MAF values close to 0.5. MAF frequencies in theJuglans dataset are more variable since this population is derived from three families. Two of these families are at frequencies close to 0.5, and the third is at less than 0.05 frequency. In theJuglans P1+P2 dataset, three distinct peaks in the MAF distribution are observed close to 0.5, 0.25, and 0.05. The abundance of SNPs with MAF ~0.125 in P1 and P2 (but not P1+P2) datasets likely indicates segregation of diploid SNPs in one of the two more frequent Juglans crosses.