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cistron (n.)
1.(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"genes were formerly called factor..."
Cistron (n.)
1.(MeSH)Specific sequences of nucleotides along a molecule of DNA (or, in the case of some viruses, RNA) which represent functional units of HEREDITY. Most eukaryotic genes contain a set of coding regions (EXONS) that are spliced together in the transcript, after removal of intervening sequence (INTRONS) and are therefore labeled split genes.
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Cistron (n.) [MeSH]
Genome Components[Hyper.]
cistron (n.)
gene; cistron; factor[ClasseHyper.]
cistron (n.)
commission de l'agriculture et pêche (fr)[Domaine]
Génétique moléculaire (fr)[Domaine]
Wikipedia
A cistron is a gene.[1] The term cistron is used to emphasize that genes exhibit a specific behavior in a cis-trans test; distinct positions (or loci) within a genome are cistronic
For example, suppose a mutation at a chromosome position is responsible for a recessive trait in a diploid organism (where chromosomes come in pairs). We say that the mutation is recessive because the organism will exhibit the wild type phenotype (ordinary trait) unless both chromosomes of a pair have the mutation (homozygous mutation). Similarly, suppose a mutation at another position, , is responsible for the same recessive trait. The positions and are said to be within the same cistron when an organism that has the mutation at on one chromosome and has the mutation at position on the paired chromosome exhibits the recessive trait even though the organism is not homozygous for either mutation. When instead the wild type trait is expressed, the positions are said to belong to distinct cistrons / genes.
For example, an operon is a stretch of DNA that is transcribed, to create a contiguous segment of RNA, but contains more than one cistron / gene. The operon is said to be polycistronic, whereas ordinary genes are said to be monocistronic.
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