exon 1 [ ek-son ] SHOW IPA / ˈɛk sɒn / PHONETIC RESPELLING EXAMPLES | WORD ORIGIN noun (in Britain) one of four yeomen of the guard who act as commanding officers in the absence of higher authority. Origin of exon 1 1645–55; earlier exant, for French exempt (spelling altered to show French pronunciation) exon 2 [ ek-son ] SHOW IPA / ˈɛk sɒn / PHONETIC RESPELLING noun . Genetics any portion of an interrupted gene that is represented in the RNA product and is translated into protein. Origin of exon 2 1975–80; ex(pressed sequence)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for exon British Dictionary definitions for exon noun British one of the four officers who command the Yeomen of the Guard Word Origin for exon
C17: a pronunciation spelling of French
exempt exempt noun any segment of a discontinuous gene the segments of which are separated by introns Compare intron Derived Forms exonic, adjective Word Origin for exon
ex- 1 + -on
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Medicine definitions for exon n. A nucleotide sequence in DNA that carries the code for the final mRNA molecule and thus defines a protein's amino acid sequence. coding sequence Related forms ex•on ′ic adj.
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Science definitions for exon A segment of a gene that contains information used in coding for protein synthesis. Genetic information within genes is discontinuous, split among the exons that encode for messenger RNA and absent from the DNA sequences in between, which are called introns. Genetic splicing, catalyzed by enzymes, results in the final version of messenger RNA, which contains only genetic information from the exons. Compare intron.
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Culture definitions for exon
Stretches of DNA in
genes that code for proteins. In eukaryotes, exons in a given gene are generally separated from each other by stretches of DNA that do not contain instructions for constructing proteins. ( Compare intron.)
The New Dictionary of Cultural Literacy, Third Edition
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