16.1 Introduction 16.2 The retrovirus life cycle involves transposition-like events 16. 3 Retroviral genes codes for polyproteins 16.4 Viral dna is generated by reverse transcription 16.5 Viral dna integrates into the chromosome 16.6 Retroviruses may transduce cellular sequences 16. 7 Yeast Ty elements resemble retroviruses 16. 8 Many transposable elements reside in D. melanogaster 16.9 Retroposons fall into two classes 16. 10 The Alu family has many widely dispersed members 消当16.1 Introduction 16.2 The retrovirus life cycle involves transposition-like events 16.3 Retroviral genes codes for polyproteins 16.4 Viral DNA is generated by reverse transcription 16.5 Viral DNA integrates into the chromosome 16.6 Retroviruses may transduce cellular sequences 16.7 Yeast Ty elements resemble retroviruses 16.8 Many transposable elements reside in D. melanogaster 16.9 Retroposons fall into two classes 16.10 The Alu family has many widely dispersed members