Table 3 The effect of population size (n) on map characteristics
ms%pets0rLt1Nt1skδt1LcNcskδcLt2Nt2skδt2LNskδnenrmc%lf%
Nm = 104, n = 200
0067411.641640.682392.11911441.3001000
200.01658183.239401.078184.3175762.33799.552
Nm = 104, n = 500
0084471.8371180.385521.62062170.9001000
200.0130.0194332.838420.989283.22381032.311010057
Nm = 104, n = 103
0073551.3401940.285651.31983140.6001000
200.0120.0186273.285661.3107382.82781312.121210062
  • pe, level of genotyping errors per marker; ms, simulated rate of missing data per marker; Nm, number of markers per LG in the initial dataset; ts, twin group size, ts0, threshold ts value: skeletal markers should obey the condition tsts0; r, kernel radius; L, Lt1, Lt2, and Lc, the estimated genetic lengths (in centimorgans) of the entire chromosome map and its subtelomeric and near-centromeric regions, while Nsk, Nt1sk, Nt2sk, and Ncsk are the corresponding numbers of intervals of the entire map and its subtelomeric and peri-centromeric regions; δ, δt1t2, and δc, map density (centimorgan/interval) of the entire map and its subtelomeric and peri-centromeric regions; ne, the number of errors in the estimated order of markers compared to the simulated order; nr, the number of “repeats” caused by fission of the initial TGs into subgroups due to genotyping errors and missing marker scores; mc (%), map coverage, which represents the proportion of the constructed skeletal map length relative to the simulated map length; lf (%), loss factor, the percentage of lost (noncharacterized) map unique positions in the constructed skeletal map compared to the simulated map; it is calculated as lf = 100 [Nskef − (Nsknr)]/Nskef, = 100 (NskefNsk + nr)/Nskef, where Nskef represents the number of intervals in the skeletal maps built for the simulated error-free data, while Nsk and (Nsknr) represent the number of noisy markers in the skeletal map, noncorrected and corrected for the number of repeats, respectively.