Most &quot;junk&quot; DNA is not actually junk. There are several different parts of DNA.<p>The most easily understandable parts are the gene coding bits, we know exactly how that works (in isolation), the DNA gets transcribed to RNA which then gets translated into an amino-acid chain that becomes a protein. If you label everything that&#x27;s not a protein encoding region of DNA as &quot;junk&quot; then you really don&#x27;t understand DNA at all.<p>Equally important are the regulation parts of DNA. These are sections of DNA before and after genes which are there to help cells control the expression of different genes.<p>Additionally, there are big chunks of DNA which exist solely to ensure the DNA has the right chemical properties and is easily stored in a cell.<p>There&#x27;s still plenty of &quot;useless&quot; parts of DNA once you account for all that, but much less &quot;junk&quot; than previously believed.