What is meant by introns?

Answer 1

Introns

are a part of your genetics that are edited out when making mRNA

after transcription. The opposite are exons,

which are the "keeper" parts. A chunk of DNA, called a gene is read and copied (like a photocopy) into a disposable piece called mRNA.

This process is called Transcription. However, the mRNA

"photocopy" isn't ready for the next step, called Translation. It needs editing. Pieces are chopped out of it and the remaining pieces are 'stitched' back together. The chopped out (trash) pieces are called introns.

The remaining pieces (keepers) are called exons.

The edited mRNA

(made up of keeper exons

pieces) is now all ready. It leaves the nucleus so it can find a ribosome

and begin translation.
Introns stay IN the nucleus (trash).
Exons

get to EXIT the nucleus (keepers

that get to move on to the next step).