noun[mass noun] Genetics
- DNA that does not code for a protein, usually occurs in repetitive sequences of nucleotides, and does not seem to serve any useful purpose.More example sentences
- Zimmer also brings up the argument that simply by making the genome bigger that junk DNA may serve a useful function by making cells the correct size.
- Ohno also proposed that a large proportion of the mammalian genome is noncoding or junk DNA.
- Since junk DNA does not code for proteins, mutations can accumulate within it without natural selection weeding them out.
More definitions of junk DNADefinition of junk DNA in:
- The US English dictionary