Junk DNA
Regions of the DNA that have no apparent function. The term "junk DNA" is a disparaging one, expressing some of the disappointment felt by geneticists when they first gazed upon sizable segments of the genetic code and, instead of seeing one wonderful gene after another, they saw a few exons surrounded by vast stretches of junk DNA. Exons are the regions of DNA that contain the code for producing the polypeptide molecules that make up protein. Each exon codes for a specific portion of the complete protein. In humans and some other species, the exons are separated by long regions of junk DNA.

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junk DNA 'jəŋk- n a region of DNA (as spacer DNA) that usu. consists of a repeating DNA sequence, does not code for protein, and has no known function

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selfish DNA.

Medical dictionary. 2011.

Look at other dictionaries:

  • junk DNA — junk DNA. = selfing DNA (см.). (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • junk DNA — junk DNA. См. избыточная ДНК. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Junk DNA — In molecular biology, junk DNA is a provisional label for the portions of the DNA sequence of a chromosome or a genome for which no function has been identified. Scientists expect to find functions for some, but not all,Fact|date=September 2008… …   Wikipedia

  • Junk-DNA — Als nichtkodierende Desoxyribonukleinsäure (engl. noncoding DNA, früher auch junk DNA) werden diejenigen Teile der Desoxyribonukleinsäure (DNA) bezeichnet, die nicht für Proteine codieren. Dennoch können sie unter den Gen Begriff fallen, da zu… …   Deutsch Wikipedia

  • Junk DNA — Als nichtkodierende Desoxyribonukleinsäure (engl. noncoding DNA, früher auch junk DNA) werden diejenigen Teile der Desoxyribonukleinsäure (DNA) bezeichnet, die nicht für Proteine codieren. Dennoch können sie unter den Gen Begriff fallen, da zu… …   Deutsch Wikipedia

  • junk DNA — noun stretches of DNA that do not code for genes most of the genome consists of junk DNA • Hypernyms: ↑deoxyribonucleic acid, ↑desoxyribonucleic acid, ↑DNA * * * noun : a region of DNA that usually consists of a repeating DNA sequence, does not… …   Useful english dictionary

  • junk DNA — noun Date: 1972 a region of DNA that usually consists of a repeating DNA sequence, does not code for protein, and has no known function …   New Collegiate Dictionary

  • junk DNA — Genomic DNA that serves, as yet, no known function …   Dictionary of molecular biology

  • junk DNA — segments of DNA that have no apparent genetic function. [1990 95] * * * …   Universalium

  • junk DNA — noun Any portion of the DNA sequence of a chromosome or a genome for which no function has been identified …   Wiktionary

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