follow Dictionary.com

Stories We Like: A Guide to the Comma

junk DNA

1.
segments of DNA that have no apparent genetic function.
Origin
1990-95
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
British Dictionary definitions for junk DNA

junk DNA

noun
1.
DNA that consists of repeated sequences of nucleotide and has no apparent function
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
junk DNA in Science
junk DNA
  (jŭngk)   
DNA that serves no known biological purpose, such as coding for proteins or their regulation. Junk DNA makes up the vast majority of the DNA in the cells of most plants and animals, composing, for example, about 95 percent of the human genome.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
junk DNA in Culture

“junk” DNA definition


Segments of DNA along a chromosome that are not genes, do not code for anything that we know of, and whose purpose we do not understand. Approximately ninety-five percent of the human genome falls into this category. The term junk may be misleading, however, as this DNA may have other functions, such as regulating genes during development.

Note: Some scientists speculate that junk DNA may be archaic material left over from an earlier stage of evolutionary development.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source

Word of The Day

Difficulty index for junk DNA

Few English speakers likely know this word

Word Value for junk

15
19
Scrabble Words With Friends