Transposable elements cause mutations when inserted within a gene. These elements disrupt the continuity of a gene.

Question:

Transposable elements cause mutations when inserted within a gene. These elements disrupt the continuity of a gene. Introns also disrupt the continuity of a gene, yet the gene is still functional.
Explain why the presence of an intron in a gene does not inactivate that gene but insertion of a transposable element does.