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1·The substitution of a purine for a pyrimidine, or vice versa is a transversion.

嘌呤为嘧啶取代或嘧啶为嘌呤所取代，叫做颠换。

2·The results show that the types of DNA base mutation included the transition, the transversion and the deletion.

结果显示：碱基变异的类型包括转换、颠换和缺失。

3·The relationship of transition and transversion of base change in 4-fold degenerate sites of coding genes of 6 proteins, which showed 70% homology in wmposition investigated.

以同源性在70%以上的6组同源蛋白为材料，从系统发生的角度研究发生在四倍简并位点上的转换和颠换的关系。