premutation

例句：

1. 1. The study of premutation is crucial for understanding the origins of life on Earth.
   研究前突变对于理解地球上生命的起源至关重要。
2. 2. Premutation has been proposed as a mechanism for generating genetic variation in bacteria.
   前突变被提出作为一种在细菌中产生遗传变异的机制。
3. 3. In the field of molecular biology, premutation refers to the process by which DNA sequences are rearrangedbefore they are copied into RNA molecules.
   在分子生物学领域，前突变指的是DNA序列在复制成RNA分子之前发生重排的过程。