junk DNA

noun

: a region of DNA that usually consists of a repeating DNA sequence, does not code for protein, and has no known function

Examples of junk DNA in a Sentence

Recent Examples on the Web Now, scientists have traced our tail loss to a short sequence of genetic code that is abundant in our genome but had been dismissed for decades as junk DNA, a sequence that seemingly serves no biological purpose. Mindy Weisberger, CNN, 23 Mar. 2024 He was taught to call it junk DNA. Quanta Magazine, 2 Nov. 2020 Questions and much debate remain around junk DNA. Daniel Bastardo Blanco, Discover Magazine, 13 Aug. 2019 Transposons are indeed junk DNA, says Ting Wang, a genomic scientist who studies transposons at the Washington University School of Medicine in St. Louis. Douglas Fox, Scientific American, 1 Feb. 2022 At the time, glial cells were considered the brain’s equivalent of junk DNA, and most neuroanatomists were not interested in them. Isaac Chotiner, The New Yorker, 12 Aug. 2021

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'junk DNA.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1963, in the meaning defined above

Time Traveler
The first known use of junk DNA was in 1963

Dictionary Entries Near junk DNA

Cite this Entry

“Junk DNA.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/junk%20DNA. Accessed 19 Apr. 2024.

Medical Definition

junk DNA

noun
: a region of DNA (as spacer DNA) that usually consists of a repeating DNA sequence, does not code for protein, and has no known function
Last Updated: - Updated example sentences
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