Figure 5.

The distribution and kinship of domestic and wild goats in this study, and principal analysis of domestic and wild goats based on SNPs of autosome. (A) Distribution of domestic and wild goats in this study. The dots indicate the main distribution areas of different goat populations, not the location of sampling. The green dots represent domestic goats, and the orange dots represent wild goats. (B) Ancestry inference based on SNPs of autosome. The CV values of domestic and wild goats were tested when the number of ancestors k was 1 to 5. The CV value was the lowest when k = 3, which indicated that the population was the most reasonable division when they had three ancestors. The x-axis represents each individual, and the y-axis represent the proportion of specific ancestral lineages. A higher proportion of a certain color indicates the higher purity of the blood relationship between the individual and a certain ancestor. (C) The consequence shows the genetic distance between domestic and wild populations. The boxes mark the populations of domestic goats, and the dots mark the populations of wild goats. (D) Positive selection signals for autosomes 1 to 29 in domestic and wild goats and biological process enrichment of genes located in positive regions. Red marks show the terms related to reproduction. This figure only shows 35 of the 179 terms. (E) A sliding window (100 kb window size, 10 kb sliding step size) was used to calculate the Fst value between domestic and wild goats, and converted into Z-transformed fixation index. The horizontal line indicates that the window where Z(Fst) ≥ 2.326 is intercepted as an assumed positively selected area.