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DNA base mutations can be divided into two categories based on their effects to the encoded amino acids: synonymous mutations http://datingranking.net/tr/koko-app-inceleme (Ks) and nonsynonymous mutations (Ka). Synonymous mutations do not result in amino acid changes, the frequency of which is represented by Ks; nonsynonymous mutations resulted in a change of amino acid, the frequency of which is indicated by Ka . Interestingly, the synonymous nucleotide substitutions occurred at a higher frequency than nonsynonymous substitutions, and thus Ka/Ks ratios are constantly <1 in most genes [9, 74], and our study is similar with this. Between different regions and genes, the Ka/Ks ratios were usually specific (Figure 8). Most conserved genes (56 of 65 genes) had an average Ka/Ks value ranging from 0 to 0.49 for the fifteen comparison groups, indicating that most genes were under purifying selection. On the contrary, the average Ka/Ks values of the ycf1 and ycf2 genes were >1 in the fifteen comparison groups, revealing that some selective pressure may execute on them in six Allium species. Previous studies have shown that ycf1 and ycf2 genes were two large open reading frames; they were important to tobacco, and the gene knockout experiments showed that ycf1 and ycf2 played important role in a healthy cell . Continue reading « The fresh proportion (Ka/Ks) is an important signal to reveal evolutionary price and pure possibilities pressure »