复本

Alternatively, a new version of a gene can also be created through reverse transcription: during gene expression, the mRNA is copied back into a sequence of DNA that is inserted into the genome.

其二，新的基因复本也可能透过反作用，将基因表出来的mRNA反DNA序列，再插回基因组，这种象称为反移位（retrotransposition），发生在称为长散布核因子（LINE）的位子活动时。