junk DNAjunk DNA
that portion of an organism's DNA that is not directly involved in protein production and has no known function
Origin of junk DNAcoined (1972) by Susumu Ohno (1928-2000), United States geneticist
A DNA sequence that is part of a genome and is not known to code for proteins or to regulate the expression of genes. Junk DNA may constitute up to 95 percent of the human genome and is postulated to be involved in the evolution of new genes and possibly the repair of genes.
Origin of junk DNAFrom junk1.