Re: What is intergenic DNA compared to introns and exons?

In contrast to bacteria which have no introns, eukaryotes (cells with a 
nucleus) have introns which are intervening sequences within genes which get 
spliced out when genes are transcribed and are not expressed in the protein. 
In contrast, exons are the sequences within a gene which do get expressed 
and translated into protein. Intergenic DNA, as the name suggests, is DNA 
between genes which does not code for proteins.


Hope this helps
gabriel vargas md/phd

References

Genes VII 
by Benjamin Lewin