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loci in Biological Definition

Allele frequency

... c) a population of individuals carrying n loci in each of their somatic cells (e.g. two loci in the cells of diploid species, which contain ... of that allele is the fraction or percentage of loci that the allele occupies within the population. ...

Molecular evolution

... , an attempt to determine for a finite population what proportion of loci would be homozygous . This was, in part, motivated by assertions by other geneticists that more than 50 percent of Drosophila loci were heterozygous , a claim they initially doubted. In order to answer ...

Bacterial conjugation

... themselves do not seem to be the structures through which the actual exchange of DNA takes place; rather, some proteins coded in the tra or trb loci seem to open a channel between the bacteria. The transfer of DNA always runs from the F-positive towards the F-negative bacterium. If the ...

Genetics

... data on the phenotype and relationships of individuals. A more recent development of quantitative genetics is the analysis of quantitative trait loci . Traits that are under the influence of a large number of genes are known as quantitative traits, and their mapping to a location on the ...

Isozyme

... the same individual . This definition encompasses (1) enzyme variants that are the product of from different genes and thus represent different loci (described as isozymes ) and (2) enzymes that are the product of different alleles of the same gene (described as allozymes ). Isozymes are ...

Locus

... The word locus (plural loci ) is Latin for "place". In biology and evolutionary computation , a locus is the position of a gene (or other significant sequence) on a ...

Major histocompatibility complex

... 500, and 300 known alleles respectively -- diversity which is truly exceptional in the human genome. And population surveys of the other classical loci routinely find tens to a hundred alleles -- still highly diverse. And perhaps even more remarkable is that many of these alleles are quite ancient: ...

Microsatellite

... of the same species. It is for this reason that microsatellite sequences can be used for genetic fingerprinting and paternity testing . Most loci of the genome, even non-coding parts, would be too similar to allow individuals to be reliably distinguished. The hypervariability arises because ...

Modern evolutionary synthesis

... the Supposition of Mendelian Inheritance ", which showed using a model how continuous variation could be the result of the action of many discrete loci . This is generally regarded as the starting point of the synthesis. Tenets of the modern synthesis According to the modern synthesis as ...

Trait

... of a diploid cell contains two of each chromosome, with homologous (mostly identical) pairs of chromosomes having the same genes at the same loci . Mendelian expression of genes in diploid organisms A gene is only a DNA code sequence; the slightly different variations of that sequence ...
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