Our assumptions of the importance of classical genes anmd genetic and evolutionary thought have been wrong in a lot of ways -- or, not necessarily wrong, but very incomplete and limited.
IIRC, you're describing an intron. Check the link for Dorland's definition of intron as well as exon, insertion and deletion.
Our assumptions of the importance of classical genes anmd genetic and evolutionary thought have been wrong in a lot of ways -- or, not necessarily wrong, but very incomplete and limited.
Actually, we have no idea of what we don't know yet.