Biotechnology and Genetics definitions beginning with Q

Biotechnology and Genetics (4,851) : A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # Definitions 1 - 16 of 16 beginning with Q

Q - permalink - collapse

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Denotes the longer of the two chromosome arms, e.g. human 10q is the long arm of human chromosome 10.
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Browse Related Terms: double crossing-over, isochromosome, metacentric chromosome, p

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q-beta replicase - permalink - collapse

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A viral RNA polymerase secreted by a bacteriophage that infects E. coli. It has the property of being able to copy RNA sequences at a rapid rate.
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Browse Related Terms: lipofection, recombinant RNA, restriction exonuclease, RNA-dependent DNA polymerase, RNA polymerase, satellite RNA, Satellite RNA (viroids), short interspersed nuclear element, transfer RNA, Transfer RNA (tRNA)

QSAR - permalink - collapse

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Abbreviation for quantitative structure-activity relationship.
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Browse Related Terms: CRP, PAR, photosynthetically active radiation, PPF, quantitative structure-activity relationship, ribulose biphosphate, RuBP

QTL - permalink - collapse

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Abbreviation for quantitative trait locus.
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Browse Related Terms: concordance, economic trait locus, ETL, fixation, genetic distance, genetic distancing, polygene

quadrivalent - permalink - collapse

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A chromosome configuration visible in late prophase and metaphase of the first meiotic division, where four chromosome s are linked by chiasmata. Can occur in autotetraploids when four homologous chromosomes pair, or in diploids as a result of heterozygosity for a reciprocal translocation between two non-homologous chromosomes.
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Browse Related Terms: asynapsis, autopolyploid, bivalent, chiasma, meiotic analysis, pairing, recombination, Synapsis, synaptonemal complex, terminalization, unequal crossing over, zygonema

quadruplex - permalink - collapse

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The inheritance of alleles in autotetraploids. A genotype AAAa will produce gametes AA, Aa in the ratio 3:1.
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Browse Related Terms: breed, broad-sense heritability, Dominant, Genotype, heritability, mutant, Phenotype, sex-influenced dominance, sport

qualitative trait - permalink - collapse

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A trait that shows discontinuous variation - i.e. individuals can be assigned to one of a small number of discrete classes.
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Browse Related Terms: continuous variation, discontinuous variation, progeny testing, quantitative genetics, quantitative trait

quantitative genetics - permalink - collapse

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The area of genetics concerned with the inheritance of quantitative traits that show continuous variation, as opposed to qualitative trait s. Since many of the critical targets in both plant and animal breeding are of this type, most practical improvement programs involve the application of quantitative genetics.
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Browse Related Terms: continuous variation, discontinuous variation, progeny testing, qualitative trait, quantitative trait

quantitative inheritance - permalink - collapse

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Inheritance of measurable traits that depend on the cumulative action of many genes and/or involve a significant proportion of non-genetic determination.
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Browse Related Terms: cytoplasmic inheritance, extrachromosomal inheritance, genetic relatedness, Horizontal gene transfer, Inheritance, maternal inheritance, Supergene, uniparental inheritance, Vertical transmission

quantitative structure-activity relationship - permalink - collapse

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(Abbreviation QSAR). A computer modelling technique that enables the prediction of the likely activity of a molecule before it is synthesized. QSAR analysis relies on recognizing associations of molecular structures and activity from historical data.
UN Food and Agriculture Organization - Cite This Source - This Definition
Browse Related Terms: CRP, PAR, photosynthetically active radiation, PPF, QSAR, ribulose biphosphate, RuBP

quantitative trait - permalink - collapse

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A measurable trait that shows continuous variation (e.g. height, weight, colour intensity, etc.) - i.e. the population cannot be classified into a few discrete classes.
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Browse Related Terms: continuous variation, discontinuous variation, progeny testing, qualitative trait, quantitative genetics

quantitative trait locus - permalink - collapse

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(Abbreviation: QTL). A locus where is associated with variation in a quantitative trait. The presence of a QTL is inferred from genetic mapping, where the total variation is partitioned into components linked to a number of discrete chromosome regions.
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Browse Related Terms: anchor gene, centiMorgan, Contiguous (contig) map, gene mapping, Genetic linkage map, genetic map, genetic mapping, Linkage map, map, map distance, map unit, Mapping, mapping function, Physical map, recombination fraction, Sequence-tagged site (STS)

quantum speciation - permalink - collapse

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The rapid formation of new species, primarily by genetic drift.
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Browse Related Terms: drift, Genetic drift, genetic erosion, random genetic drift

quarantine - permalink - collapse

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Isolation for a period after arrival in a new location, to allow any pre-existing disease symptoms to appear. Used in the context of regulations restricting the sale or shipment of living organisms, usually to prevent disease or pest invasion of an area.
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Browse Related Terms: abiotic, biocontrol, biopolymer, biosphere, catabolism, Endophyte, essential element, In vivo, infection, living modified organism, LMO, nitrogen assimilation, organism, vitamin

quaternary structure - permalink - collapse

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A level of protein structure where several individual molecules assemble together and form a functional cluster. A classic example is haemoglobin, a complex of four myoglobin-like units. See: tertiary structure.
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Browse Related Terms: alpha globulin, haptoglobin, hemoglobin

quiescent - permalink - collapse

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A temporary suspension or reduction in the rate of activity or growth, while retaining the potential to resume prior activity. Applies particularly to cell division. See: dormancy.
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Browse Related Terms: derivative, kinin, proliferation, reduction division, spermatid, spermatocyte, tunica

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