loci

Trait

... 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 are called alleles. Alleles can be significantly different and produce different product RNAs . Comb...

Modern evolutionary synthesis

...ould 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 established in the 1930s and 1940s , genetic variation in populations arises by chance through mutation ...

Molecular evolution

...termine for a finite population what proportion of loci would be homozygous . This was, in part, motivat...icists that more than 50 percent of Drosophila loci were heterozygous , a claim they initially doubted. In order to answer this question they assumed ...

Microsatellite

...etic 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 the repeated simple sequences cause a high frequency of loss or insertion of additional repeats by conf...

Major histocompatibility complex

...me. 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: it is often the case that an allele from a particular HLA gene is more closely related to an allele f...

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 chromosome . A locus can be occupied by any of the alleles of the gene. Diploid or polyploid...

Isozyme

...om 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 usually the result of gene duplication , but can also arise from polyploidisation or hybridization...

Genetics

...ve 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 chromosome requires accurate phenotypic, pedigree and marker data from a large number of related individuals....

Bacterial conjugation

... 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 F-plasmid is free, a nick is produced in one of the circular DNA strands of the plasmid. Then, the single-st...

Allele frequency

...locus, 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 two sets of chromosomes) and finally d) a variant o...