The variations of nucleotide mainly occurred the replace of synonymous codons.

核苷酸序列变化主要表现在同义密码子的置换。

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The numerical results for a group of roughly estimated parameters show that the proposed model may be able to explain the nonrandom usage of synonymous codons.

对干一组粗略估计的参数进行数值计算的结果表明，本文提出的模型能较好地解释同义密码于的非均匀使用问题。

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The relative usage degree of the synonymous codon is computed and the use of preferences of the synonymous codon in 78 human genes (19967 codons) is analysed based on the quasi-amino acids coding.

计算了基于拟氨基酸编码方法下的同义密码子的相对使用度，分析了78个人类基因(19967个密码子)中基于拟氨基酸编码方法下的同义密码子的偏好使用情况。

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