Definition of junk DNA in English:

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junk DNA


[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.
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.

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