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

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

cis·tron′ic adj.


(Genetics) genetics the section of a chromosome that encodes a single polypeptide chain
[C20: from cis-trans; see cis-trans test]


(ˈsɪs trɒn)

a segment of DNA that codes for the formation of a specific protein; a structural gene.
[1955–60; cis- + tr (ans)- + -on1]
cis•tron′ic, adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.cistron - (genetics) a segment of DNA that is involved in producing a polypeptide chaincistron - (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 factors"
dominant gene - gene that produces the same phenotype in the organism whether or not its allele identical; "the dominant gene for brown eyes"
allele, allelomorph - (genetics) either of a pair (or series) of alternative forms of a gene that can occupy the same locus on a particular chromosome and that control the same character; "some alleles are dominant over others"
genetic marker - a specific gene that produces a recognizable trait and can be used in family or population studies
homeotic gene - one the genes that are involved in embryologic development
lethal gene - any gene that has an effect that causes the death of the organism at any stage of life
linkage group, linked genes - any pair of genes that tend to be transmitted together; "the genes of Drosophila fall into four linkage groups"
modifier gene, modifier - a gene that modifies the effect produced by another gene
mutant gene - a gene that has changed so that the normal transmission and expression of a trait is affected
nonallele - genes that are not competitors at the same locus
operator gene - a gene that activates the production of messenger RNA by adjacent structural genes
oncogene, transforming gene - a gene that disposes normal cells to change into cancerous tumor cells
polygene - a gene that by itself has little effect on the phenotype but which can act together with others to produce observable variations
proto-oncogene - a normal gene that has the potential to become an oncogene
recessive gene - gene that produces its characteristic phenotype only when its allele is identical; "the recessive gene for blue eyes"
regulator gene, regulatory gene - a gene that produces a repressor substance that inhibits an operator gene
repressor gene - gene that prevents a nonallele from being transcribed
structural gene - a gene that controls the production of a specific protein or peptide
suppresser gene, suppressor gene, suppresser, suppressor - a gene that suppresses the phenotypic expression of another gene (especially of a mutant gene)
transgene - an exogenous gene introduced into the genome of another organism
X-linked gene - a gene located on an X chromosome
holandric gene, Y-linked gene - a gene located on a Y chromosome
chromosome - a threadlike strand of DNA in the cell nucleus that carries the genes in a linear order; "humans have 22 chromosome pairs plus two sex chromosomes"
genetic science, genetics - the branch of biology that studies heredity and variation in organisms
molecular biology - the branch of biology that studies the structure and activity of macromolecules essential to life (and especially with their genetic role)
sequence - serial arrangement in which things follow in logical order or a recurrent pattern; "the sequence of names was alphabetical"; "he invented a technique to determine the sequence of base pairs in DNA"
deoxyribonucleic acid, desoxyribonucleic acid, DNA - (biochemistry) a long linear polymer found in the nucleus of a cell and formed from nucleotides and shaped like a double helix; associated with the transmission of genetic information; "DNA is the king of molecules"
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