Final answer:
Genomes do not 'explode' through transition due to various mechanisms that mitigate the dangers of rampant transposition. These include transposition occurring mostly in non-coding regions, having two copies of each gene in eukaryotes, and mechanisms to silence transposons after transposition. Small interfering RNAs (siRNAs) also play a role in targeting and destroying transposon transcripts.
Step-by-step explanation:
The reason genomes do not 'explode' through transition is due to several factors that mitigate the dangers of rampant transposition. First, most transposition events occur in the non-coding regions of the genome. Additionally, eukaryotic organisms have two copies of every gene, so if one becomes inactive, the other can compensate. Furthermore, mechanisms exist to silence transposons after they have transposed, such as mutations at the ends of transposons or in genes responsible for transposition. Finally, small interfering RNAs (siRNAs) can target and destroy transposon transcripts.