在同源性方面，在进化上比较接近的物种，基因的密码子使用频率和使用偏性指标比较接近或基本相同。
Moreover, species with near homology relationship on evolution share the near codon usage frequency and preference index or the similar index.
RNA病毒的聚合酶基因总体上和宿主密码子使用类型不一致，限制了聚合酶基因的及早和过高表达，但其密码子使用频率对聚合酶的限制是适中的。
RNA polymerase in RNA virus is different from host cells restrict it's high and early expression. The restrict is moderate compared with other virus genes.
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