中文摘要：

根据突变危险性极小化的方法，导出各物种线粒体非标准遗传密码表的总体突变危险性极小表，证明了各非标准遗传密码表是在一些约束条件下的总体突变危险性极小表，体现了分子进化遵循稳定性原理，并受冻结偶然性制约．

英文摘要：

According to the conception and formulation of minimal mutational deterioration, we deduce the minimization of the global mutational deterioration （GMD） of all nonstandard Mitochondrial genetic codes. It is demonstrated that each nonstandard genetic code is a minimal code under some constraints, which shows both the evolutionary stability principle and the ＇frozen accident＇ which play a role in the evolution.