Non-chromosomal gene is a science that studies the mechanisms of organism development without the participation of a chromosomal set of DNA. Unlike most genes, which are contained on chromosomes, these genes are transmitted through chemical signals controlled by processes outside the DNA, such as mitosis. The genetic code does not contain direct instructions for creating new protein molecules; instead, signals for specific amino acids can come from a non-chromosome.
How do non-chromosomal gene control processes occur? In most organisms, the genetic codes are contained within a genome, divided between parts called allelic chromatids. These chromatids are like duplicate copies of all DNA, and each one contains a copy of each chromosome and two allelic genes. The process of protein production begins when allelic genes are denatured and retained in chromatin molecules consisting of proteins and nucleic acids. A sequence of biochemical reactions then determines which RNA is incorporated into the DNA to form one strand of RNA and then a protein to perform a function in the body.
However, there are other RNA and DNA molecules, such as viruses, elements of the nuclear apparatus and mitochondria, which have a genome outside the chromosomal framework. Sporadically, some viruses acquired the ability to independently replicate and produce new generations in a cell, regardless of chromosomes