These 8 y - str loci were amplified with pcr and the products of pcr were analyzed using gel electrophoresis . each allele of these 8 y - str loci was sequenced and the allele ladders were constructed in house . alleles of these y - str loci were nominated according to recommends of the international society of forensic genetics 应用pcr方法扩增y - str ，电泳分型；对所有基因座的等位基因进行测序，构建等位基因分型标准物，按国际法医遗传学会( isfg )原则命名等位基因。
