null allele

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null allele

A segment of DNA which is not known to encode a protein product.

null allele

a form of a gene whose product is either absent at the molecular level, or is present but has no measurable phenotypic function. For example, in a heterozygote with INCOMPLETE DOMINANCE one gene form is a ‘null allele’ and is inactive, while the other allele is unable to compensate for the null allele and so produces an intermediate phenotype.

allele

one of two or more alternative forms of a gene at the same site or locus in each of a pair of chromosomes, which determine alternative characters in inheritance. Called also allelomorph.
blank allele
an allele which produces an antigen which cannot be detected.
null allele
see silent allele (below).
silent allele
one that produces no detectable effect.
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References in periodicals archive ?
This phenomenon may result from inbreeding, natural selection, null alleles, and genetic drift (Lowe et al.
GENETIC VARIATION AND DIFFERENTIATION IN WILD AND SELECTED MANILA CLAM INFERRED FROM MICROSATELLITE LOCI
Null alleles were detected only in one locus (Sat 5) in individuals from Santa Maria del Mar.
Variacion y estructura genetica de la liebre en peligro de extincion, Lepus flavigularis (Lagomorpha: Leporidae)
However, the presence of null alleles was observed only in Bh8, and probably should not have affected genetic variability in this case.
Cross-amplification of heterologous microsatellite markers in Piracanjuba/Amplificacao cruzada de marcadores microssatelites heterologos em piracanjuba
Of the 7 microsatellites analyzed, the locus Obo19TUF consistently showed the presence of null alleles in all sample sites, thus this locus was eliminated from the analyses.
Genetic population structure and evidence of genetic homogeneity in populations of the Argentinian silverside Odontesthes bonariensis (Teleostei: Atherinopsidae) inhabiting central and northwestern Argentina
These results are consistent with a previously inferred prevalence of null alleles (Ewers-Saucedo et al.
Parallel Patterns of Host-Specific Morphology and Genetic Admixture in Sister Lineages of a Commensal Barnacle
These mismatches can be ascribed to the presence of allelic drop-out, null alleles or high frequency of mutations resulting in 2-4 bp shifts.
Microsatellite analysis detects low rate of extra-pair paternity in Tengmalm's owl, Aegolius funereus
Null alleles were detected at three loci (AV13, MSMM2, and MSMM6), but because they were not consistently detected across all subspecies (Appendix II) we used all loci in subsequent analyses.
Range-wide microsatellite analysis of the genetic population structure of Prairie voles (Microtus ochrogaster)
Effects of microsatellite null alleles on assignment testing.
Inheritance of fifteen microsatellite loci in Ceratitis capitata (Diptera: Tephritidae)
Screening of data for large allele dropout, null alleles and scoring errors was carried out using MicroChecker (Van Oosterhout et al.
Diversidad genetica de dos especies de abejas sin aguijon, Trigona nigerrima (Cresson) y Trigona corvina (Cockerell) en paisajes cafetaleros del Sureste de Mexico
Three loci displayed significant departure from Hardy-Weinberg equilibrium expectations, likely reflecting occurrence of null alleles.
Development and characterization of microsatellite markers for blackfin tuna (Thunnus atlanticus) with the use of Illumina paired-end sequencing
The probability of null alleles (r) was calculated for each microsatellite, as described by Brookfield (1996):
Use of microsatellite markers to assess the identity and genetic diversity of vitis labrusca and vitis rotundifolia cultivars/Uso de marcadores microssatelites para acessar a identidade e diversidade genetica de cultivares de vitis labrusca e vitis rotundifolia
22-24]detected different null alleles, including Wx-A1.
Investigation of diversity of Waxy-A1 gene using amplification in different spices in A genome wheat's

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