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答案：Retrotransposons are first transcribed into an RNAintermediate.;Next,a double-stranded DNAcopy of this RNAis synthesized by the enzyme reverse transcriptase.This DNAcopy is then inserted into the target location,which can be on either the same or a different DNAmolecule.;The donor retrotransposon remains at its original location,so each time it transposes,it duplicates itself.;These mobile genetic elements are called retrotransposons because at one stage in their transposition their genetic information flows backward,from RNAto DNA.
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