Table 2 Minimum number of SNP and/or STR loci required per category for a relatedness category assignment with >95% (>80%) correct classification rates
Mating SystemMarkerMAFPOFSR = 0.25R = 0.125aUnrelb
MonogamySNP0.053200 (800)1600 (800)3200 (1600)− (−)50 (50)
0.25200 (100)200 (200)1600 (800)− (−)50 (50)
0.5100 (100)200 (100)1600 (400)− (−)50 (50)
STRn/a80 (40)80 (40)− (–)− (−)10 (10)
SNP and STRc0.05800 (100)800 (100)3200 (800)− (−)50 (50)
0.25100 (50)200 (50)1600 (400)− (−)50 (50)
0.5100 (50)200 (50)1600 (400)− (−)50 (50)
PolygynySNP0.051600 (800)3200 (1600)3200 (800)− (−)50 (50)
0.25200 (100)800 (400)800 (400)− (−)50 (50)
0.5100 (100)400 (200)800 (400)− (−)50 (50)
STRn/a40 (40)− (80)− (–)− (−)10 (10)
SNP and STR0.05400 (100)1600 (800)1600 (800)− (−)50 (50)
0.25100 (50)800 (200)800 (400)− (−)50 (50)
0.550 (50)400 (200)800 (400)− (−)50 (50)
PromiscuitySNP0.05800 (400)− (−)3200 (800)− (−)50 (50)
0.25200 (100)− (−)1600 (400)− (−)50 (50)
0.5100 (100)− (−)1600 (400)− (−)50 (50)
STRn/a40 (40)− (−)− (–)− (−)10 (10)
SNP and STR0.05200 (50)− (−)3200 (800)− (−)50 (50)
0.2550 (50)− (−)1600 (400)− (−)50 (50)
0.550 (50)− (−)800 (400)− (−)50 (50)
  • Dashes indicate that the category could not be assigned with a >95% (80%) correct classification rate with the simulated number of loci. SNP, single-nucleotide polymorphism; STR, short-tandem repeat; MAF, minor allele frequency; PO, parent-offspring; FS, full sibs; R = 0.25, avuncular, half sibs, grand-parent-grand offspring; R = 0.125, full cousins, half avuncular.

  • a Even though no number of tested loci led to a 95% (80%) correct classification rate for the R = 0.125 category under the simulated population conditions, R = 0.125 is part of this table because it is important to include it in the relatedness category assignment for the correct classification rates of R = 0.25.

  • b Note that with the population size and parameters used, more than >95% of individuals are unrelated (Unrel), so even if all dyads were assigned to the category ‘unrelated’ the correct classification rates might be >95%.

  • c Number of SNP loci required when combined with 20 STR loci.