Definition & Betydelse | Engelska ordet ALLELES

Definition av ALLELES

1. böjningsform av allele

Exempel på hur man kan använda ALLELES i en mening

• Genotype can also be used to refer to the alleles or variants an individual carries in a particular gene or genetic location.
• Partial imprinting occurs when alleles from both parents are differently expressed rather than complete expression and complete suppression of one parent's allele.
• The term trait is generally used in genetics, often to describe phenotypic expression of different combinations of alleles in different individual organisms within a single population, such as the famous purple vs.
• "Mutant" alleles can vary to a great extent, and even become the wild type if a genetic shift occurs within the population.
• They are often the result of population bottlenecks from larger populations, leading to loss of heterozygosity and reduced genetic diversity and loss or fixation of alleles and shifts in allele frequencies.
• Histocompatibility, or tissue compatibility, is the property of having the same, or sufficiently similar, alleles of a set of genes called human leukocyte antigens (HLA), or major histocompatibility complex (MHC).
• The neutral theory of molecular evolution holds that most evolutionary changes occur at the molecular level, and most of the variation within and between species are due to random genetic drift of mutant alleles that are selectively neutral.
• With sexual reproduction, recombination scrambles alleles into different genotypes every generation; in this case, fitness values can be assigned to alleles by averaging over possible genetic backgrounds.
• The Bengal tiger is defined by three distinct mitochondrial nucleotide sites and 12 unique microsatellite alleles.
• Markers on different chromosomes are perfectly unlinked, although the penetrance of potentially deleterious alleles may be influenced by the presence of other alleles, and these other alleles may be located on other chromosomes than that on which a particular potentially deleterious allele is located.
• Linkage disequilibrium, in genetics, when alleles occur together more often than they would by chance.
• Both of these branches of genetics use the frequencies of different alleles of a gene in breeding populations (gamodemes), and combine them with concepts from simple Mendelian inheritance to analyze inheritance patterns across generations and descendant lines.
• Diversifying selection is the hypothesis that two subpopulations of a species live in different environments that select for different alleles at a particular locus.
• As early as 1930 Fisher had discussed a situation where, with alleles at a single locus, the heterozygote is more viable than either homozygote.
• While research had already emphasized the role of alleles in determining wing-color phenotype, it was still unknown whether the melanic alleles had a single origin or had arisen multiple times independently.
• Homozygosity, with homo relating to same while zygous pertains to a zygote, is seen when a combination of either two dominant or two recessive alleles code for the same trait.
• This comes from the observation that microsatellite alleles usually are length polymorphic; specifically, the length differences observed between microsatellite alleles are generally multiples of the repeat unit length.
• A haplotype (haploid genotype) is a group of alleles in an organism that are inherited together from a single parent.
• In population genetics, linkage disequilibrium (LD) is a measure of non-random association between segments of DNA (alleles) at different positions on the chromosome (loci) in a given population based on a comparison between the frequency at which two alleles are detected together at the same loci versus the frequencies at which each allele is simply detected (alone or with the second allele) at that same loci.
• Psychoactive constituents of chocolate that trigger a ‘feel-good’ reaction for the consumer include tryptophan and phenylethylamine, which may contribute to cravings and addiction-like responses, particularly in people with specific genetic alleles.

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