Ancestral information Markers(AIMs) can be utilized for analysis of population genetic structure.In this study,AIMs were selected from Illumina Ovine SNP50 chip in blackbone sheep and other eight kinds of Asian sheep populations by Informativeness-statistic defined by Rosenberg.Then subsets of 20,50,100,500 SNPS loci with higher Informativeness value and the corresponding number of random SNP loci were used to infer the population genetic structure,respectively.Principal component analysis(PCA) and fast STR...