Question

what is unwanted gene ?

Answer 1

introns are the unwanted genes . basically termed as junk dna , they are the genes which are transcripted into mRNA but are then spliced during post transcriptional modifications , hence , they are not translated into proteins , only exons are translated . also almost 95 percent of our DNA is junk DNA

Answer 2

Introns are not junk DNA.

They don't end up in proteins, but many end up acting as biologically relevant affectors themselves.

Like miR-34, which is non-transcribed DNA from one gene, an intron that gets spliced out before translation. But binds to a whole lot of other mRNAs involved in cancer development and is starting to be considered as important and something like p53 (so a very important protein) for regulating cell cycle progression.

Answer 3

The RNA world is less easily studied than the protein world, that's why people are only just starting to appreciate that it's as important (possibly more important) in all the standard protein stuff like gene regulatory networks.