**Figure 8:** (A) Three-SNP multiple linear regression (MLR) models for natural log
of the hair ratio’s melanins across populations (test sample set). The horizontalaxis
depicts all 3654 combinations (i.e., 29-choose-3) of significant SNPs in a
three-SNP MLR model. The vertical-axis is the R^{2} value for each model (black
curve or three-SNP R^{2} curve) and also the SNP function value for each SNP
curve. The R^{2} curve inflection (i=149) is indicated by a vertical black line. The
SNP curves of the three highest frequency SNPs at i=149 are indicated by
colors (rs12913832 (HERC2), blue; rs16891982 (SLC45A2), red; rs1426654
(SLC24A5), green). (B) Bar plot of the SNPs that were present in all models
from i=1 to i=149. |