from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A section of DNA that contains the genetic code for a single polypeptide and functions as a hereditary unit.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun Sometimes used interchangeably with the word gene, a cistron is the unit of hereditary material (e.g. DNA) that encodes one protein.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun (genetics) a segment of DNA that is involved in producing a polypeptide chain; it can include regions preceding and following the coding DNA as well as introns between the exons; it is considered a unit of heredity


from The American Heritage® Dictionary of the English Language, 4th Edition

[From cis-trans test, a genetic test (cis– + trans–) + –on.]


  • They explicitely explain that streptomycin resistance is the result of the organisms singular rRNA cistron, which renders them with one reversible mutation from almost completely resistant/non-resistant.

    Browsing the Latest Issue of Scientific American

  • This idea is expressed by the classic slogan of Beadle: "one gene - one enzyme", or in the more sophisticated but cumbersome terminology of today: "one cistron - one polypeptide chain".

    Francis Crick - Nobel Lecture

  • As I was grappling with some of the more technical passages that contained words like allele, nucleotide, cistron, and mitosis,

    The Full Feed from


Log in or sign up to get involved in the conversation. It's quick and easy.