Recessive gene

gene (jēn) the biologic unit of heredity, self-reproducing and located at a definite position (locus) on a particular chromosome.

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allelic gene  allele.

chimeric gene  an artificial gene constructed by juxtaposition of fragments of unrelated genes or other DNA segments, which may themselves have been altered.

complementary genes  two independent pairs of nonallelic genes, neither of which will produce its effect in the absence of the other.

dominant gene  one that is phenotypically expressed when present in homozygotes or heterozygotes.

H gene , histocompatibility gene one that determines the specificity of tissue antigenicity (HLA antigens), and thus the compatibility of donor and recipient in tissue transplantation and blood transfusion.

holandric genes  genes in the nonhomologous region of the Y chromosome.

immune response (Ir) genes  genes of the major histocompatibility complex that govern the immune response to individual immunogens.

Is genes  genes that govern the formation of suppressor T lymphocytes.

lethal gene  one whose presence brings about the death of the organism or permits survival only under certain conditions.

mutant gene  one that has undergone a detectable mutation.

operator gene  one serving as a starting point for reading the genetic code, and which, through interaction with a repressor, controls the activity of structural genes associated with it in the operon.

recessive gene  one that produces an effect in the organism only when it is homozygous.

regulator gene , regulatory gene

1. in genetic theory, one that synthesizes repressor, a substance that through interaction with the operator gene switches off the activity of the structural genes associated with it in the operon.

2. any gene whose product affects the activity of other genes.

repressor gene  regulator g. (1).

sex-linked gene  one carried on a sex chromosome, especially on an X chromosome.

split gene  a gene containing multiple exons and at least one intron.

structural gene  one that specifies the amino acid sequence of a polypeptide chain.

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recessive gene

n.

A gene that is phenotypically expressed in the homozygous state but has its expression masked in the presence of a dominant gene.

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Recessive gene

A type of gene that is not expressed as a trait unless inherited by both parents.

Mentioned in: Genetic Testing, Mucopolysaccharidoses

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recessive gene

a gene which expresses itself in the homozygous state, but not in the presence of the dominant allele.