one of three or more alternative forms of allelic series that all map to a specific locus
Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row ...
MULTIPLE ALLELES It makes absolutely no sense whatsoever to continue if we don't know what the word "allele" means.
Diploid organisms naturally have a maximum of 2 alleles for each gene expressing a particular characteristic, one deriving from each parent.
Many genes have more than two alleles (even though any one diploid individual can only have at most two alleles for any gene), such as the ABO blood groups in humans, which are an example of multiple alleles. Multiple alleles result from different mutations of the same gene.
In the previous case, there were only 2 alleles for one gene. In the case of the ABO blood grouping, there are 3 alleles for one gene and in this situation they are written a little differently: ...
~ a condition in which more than two alleles exist for a characteristic; one example is A, B, AB, and O blood types.
muscle contraction a process in which actin and myosin proteins move within a sarcomere.
~ is the phenomenon in which the same gene has more than two different alleles (in normal mendelian inheritance the gene has only two alleles). Obviously these alleles combine in pairs to form the genotypes.
~ term used to describe a gene which has more than two possible alleles.
Muscle a tissue consisting of contractile fibres that can produce movement
Mutation a change in the amount or the arrangement of the genetic material in a cell.
~ A condition in which more than two alleles exist for a given trait.
multiple fission Asexual reproduction by the splitting of a cell or organism into many cells or organisms. See schizogony.
An example of ~ is blood type. There are three alleles for blood type, A, B, and O. Because of this, people can have blood type A, B, AB, or O. AA or AO results in type A, BB or BO in type B, AB results in AB, and OO results in type O.
 Genetic Disorders ...
Mosaics, genetic Moss[life cycle] [evolutionary relationships] Motor unit M-phase promoting factor (MPF) MPS-I (mucopolysaccharidosis I) ~More than two alleles found at a give gene locus in a population.
In these cases, natural selection will maintain ~ at that locus.
Heterozygous advantage maintains genetic diversity at the human gene for one chain of hemoglobin.
Homozygous recessive individuals suffer from sickle-cell disease.
The ABO blood group is a good example of codominance and ~. There are three allele that control the ABO blood groups. If there are more than two allele of a gene then they are called multiple allele.
~ at a locus differed in sequence, but their fitnesses were the same. Kimura's neutral theory described rates of evolution and levels of polymorphism solely in terms of mutation and genetic drift.
Genetic influences on fitness are typically small, and many variants usually affect the same trait, so adaptation is generally the result of small changes in frequency of ~: a 'soft sweep' .
Hardy-Weinberg equations can be written for traits with ~ in the same way we just wrote one for two alleles. For example, the Hardy-Weinberg equation for a trait with three alleles whose frequencies were p, q, and r would be (p + q + r)2 = 1 .
Extended expression patterns seen in diploid organisms include facets of incomplete dominance, codominance, and ~ .
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Most traits have ~. Sometimes the terms allele and gene are used interchangeably. Although mutations are often undesirable, some are neutral or even beneficial.
See also: What is the meaning of Alleles, Allele, Genetics, Gene, Human?