cistron

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cistron

 [sis´tron]
the smallest unit of genetic material that must be intact to function as a transmitter of genetic information; as traditionally construed, approximately synonymous with gene.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

cis·tron

(sis'tron),
1. The smallest functional unit of heritability; a length of chromosomal DNA associated with a single biochemical function. Under classical concepts, a gene might consist of more than one cistron; in modern molecular biology, the cistron is essentially equivalent to the structural gene.
2. The genetic unit defined by the cis/trans test.
[cis tr-ans + -on]
Farlex Partner Medical Dictionary © Farlex 2012

cistron

(sĭs′trŏn′)
n.
A section of DNA that contains the genetic code for a single polypeptide and functions as a hereditary unit.

cis·tron′ic adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

cis·tron

(sis'tron)
1. The smallest functional unit of heritability; a length of chromosomal DNA associated with a single biochemical function. In modern molecular biology, the cistron is essentially equivalent to the structural gene.
2. The genetic unit defined by the cis/trans test.
[cistr-ans + -on]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

cistron

A short length of DNA that codes for a protein subunit (a polypeptide), together with adjacent sequences that control its expression. It is the smallest unit that transmits genetic information.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

cistron

or

functional gene

a portion of DNA coding for one POLYPEPTIDE CHAIN or other gene product. The one gene/ one enzyme hypothesis thus becomes the ‘one cistron (gene)/one polypeptide’ hypothesis or ‘one gene/one functional product’ hypothesis.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005