High resolution melting analysis of DNA mixtures. DNA extracted from Kor and Kal monovarietal olive oil was mixed in four different ratios; 95% Kor + 5% Kal, 85% Kor + 15% Kal, 75% Kor + 25% Kal and 50% Kor + 50% Kal. Curves of different ratios mixtures in normalized difference plots using four different DNA markers, two SSRs and two SNPs. (A) ssrOe-DCA18, (B) ssrOe-DCA9, (C) SNP3 and (D) SNP2.