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Biology  Polymorphic loci  Polymorphisms

A polymorphism is a genetic variant that appears in at least 1% of a population.
Examples: ...

more than two types of castes of individuals in a colony or community that belong in the same species and are derived from the same parents. The various castes of honeybees, ants, termites, and so forth are typical ...

Differences between individuals in a population.
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The occurrence in a population (or among populations) of several phenotypic forms associated with alleles of one gene or homologs of one chromosome. See genetic polymorphism.

Polymorphism in the immune system
Immune system genes are exceptionally polymorphic, reflecting in part selection by diverse and rapidly varying pathogens, but also the need to balance effective pathogen elimination against the risk of self-destructive reactions.

Genetic polymorphisms are genetic variations in genes, e.g., single nucleotide polymorphisms (SNP).
This category has only the following subcategory.

Polymorphism, by strict definitions which hardly anybody pays attention to anymore, is a place in the DNA sequence where there is variation, and the less common variant is present in at least one percent of the people of who you test.

TAG: Restriction fragment length polymorphism
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Polymorphisms in the wild, ornamental, and edible groups
The number of SNPs in the wild (3,381,514), ornamental (1,065,215) and edible (2,098,002) groups account for 74.04%, 23.32%, and 45.94%, respectively, of all SNPs in the whole population (Figure S11 in Additional file 2).

Polymorphism: a term to show that mutations do occur in the Y chromosome, as can happen with other chromosomes. It is a naturally occurring or induced variation in the sequence of genetic information on a segment of DNA.

Polymorphism. Differences among alleles, microsatellites, or SNPs that define different strains of mice.
Polytropic retrovirus. Retrovirus, either leukemia virus or mammary tumor virus, with tropism for mouse cells and cells from other species.

Polymorphism occurrence of several distinct forms of a species in the same habitat at the same time
(poly = many; morpho = form)
Polypeptide a chain of amino acids bonded together
(poly = many; pepti = digested‚ cooked) ...

Difference in DNA sequence among individuals that may underlie differences in health. Genetic variations occurring in more than 1% of a population would be considered useful polymorphisms for genetic linkage analysis.
See also: mutation
Polypeptide ...

STR Polymorphisms
Most of our DNA is identical to DNA of others. However, there are inherited regions of our DNA that can vary from person to person. Variations in DNA sequence between individuals are termed "polymorphisms".

Indel polymorphism: Insertion/deletion polymorphism. See Description of Sequence Changes for indel polymorphisms.

Genetic polymorphism
The existence of two or more genetically different classes within a population.

What is polymorphism?
What is polymorphism in Zoology?
How many molecules of carbon dioxide are produced of each molecule of glucose that passes through glycolysis and cellular respiration?
1, 2, 3, 6 are the choices ...

Difference in DNA sequence among individuals. Applied to many situations ranging from genetic traits or disorders in a population to the variation in the sequence of DNA or proteins.

- The presence of several forms of a trait or a gene in a population
Potato ...

polymorphism ((biology) the existence of two or more forms of individuals within the same animal species (independent of sex differences))
pleomorphism ((biology) the appearance of two or more distinctly different forms in the life cycle of some organisms) ...

polymorphism The presence in a species of more than one structural type of individual.
polynomial A scientific name for an organism composed of more than two words.
polynucleotide A nucleotide of many mononucleotides combined.

A polymorphism, the existence of two or more forms of sequence between different individuals of the same species, can arise from a change in a single nucleotide. These single nucleotide polymorphisms (SNPs) account for ninety percent of all polymorphisms in humans.

A polymorphism also refers to any biologic marker (DNA, RNA or protein) with two or more states.

(C) Polymorphism
(D) Creationism
Count George-Louis Leclerc de Buffon said that species: ...

Genetic polymorphism. Presence of several genetically controlled variants in a population
Genotype. The genetic makeup of an organism, with respect to a given genetic locus, the alleles it carries ...

Sequence polymorphism differing in a single base pair.
Example for a single nucleotide substitution:
Rice cultivars with 18% or less amylose had the sequence AGTTATA at the putative leader intron 5' splice site, while all cultivars with ahigher proportion of amylose had AGGTATA.

A type of polymorphism in which the frequencies of the coexisting forms do not change noticeably over many generations.
All tissues external to the vascular cambium in a plant growing in thickness, consisting of phloem, phelloderm, cork cambium, and cork.

Balanced polymorphism: The maintenance of two or more alleles in a population due to a selective advantage of the heterozygote.

Polymorphism A Difference in DNA sequence among individuals. Genetic variations occurring in more than 1% of a population would be considered useful polymorphisms for genetic linkage analysis. Compare mutation.
Predisposition Intrinsic likelyhood of developing a particular disorder.

Polymorphism Variations in DNA sequences in a population that are detected in human DNA identification testing. PopStats FBI CODIS software program used to perform statistical DNA match estimates.

single nucleotide polymorphism (SNP) /pawl-ee-MORE-fiz-əm/ n. DNA sequence variations that occur when a single nucleotide (A, T, C, or G) in the genome sequence is altered. See also: mutation, polymorphism, single-gene disorder.

(See DNA polymorphism.) Alternative mRNA splicing. The inclusion or exclusion of different exons to form different mRNA transcripts. (See RNA.) Amino acid. Any of 20 basic building blocks of proteins-- composed of a free amino (NH2) end, a free carboxyl (COOH) end, and a side group (R).

Balanced polymorphismAn equilibrium of two or more alleles that has remained constant over long periods of time. Barr bodyThe sex chromatin, the visible inactive X chromosome on the somatic cell nuclear membrane.

The tendency for natural selection to reduce variation is countered by mechanisms that preserve or restore variation, including diploidy and balanced polymorphisms.

with Metropolis Algorithm using Random Coalescence: LAMARC is a package of programs for computing population parameters, such as population size, population growth rate and migration rates by using likelihoods for samples of data (sequences, microsatellites, and electrophoretic polymorphisms) from ...

Plasminogen activator inhibitor-1 (PAI-1) plasma levels have been consistently related to a polymorphism (4G/5G) of the PAI-1 gene. The renin-angiotensin pathway plays a role in the regulation of PAI-1 plasma levels.

Restriction fragment length polymorphisms (RFLPs) are derived from sequence variation that results in the loss of a restriction enzyme digestion site. The result is a longer fragment of the DNA from that location following digestion with that enzyme.

RFLP: Restriction fragment length polymorphism; the acronym is pronounced "riflip". Although two individuals of the same species have almost identical genomes, they will always differ at a few nucleotides.

Restriction Fragment Length Polymorphism (RFLP) A DNA variation that affects the distance between restriction sites (most often by a nucleotide change that creates or eliminates a site) within or flanking a DNA fragment recognized by a cloned probe (see Chapter 8).

SSLP Simple Sequence Length Polymorphisms (SSLPs) are markers that detect differences in the length of a PCR product. Typically the differences are due to small insertions/deletions such as those caused by differences in the number of simple sequence repeats.

amplified fragment length polymorphism (AFLP)
A technique that uses PCR to amplify genomic DNA, cleaved by restriction enzymes, in order to generate DNA fingerprints; it is a combination of RFLP and arbitrary primer PCR. It does not require prior sequence knowledge.

Restriction fragment length polymorphism (RFLP), shown above, is an older DNA-profiling technique. It has largely been replaced by PCR amplification of repetitive DNA segments that vary in length among individuals.
Is DNA evidence alone enough to acquit or convict?

restriction fragment length polymorphism (RFLP) A heritable difference in DNA fragment length and fragment number; passed from generation to generation in a codominant way.
retina The inner, light-sensitive layer of the eye; includes the rods and cones.

RFLP restriction fragment length polymorphism; a technique using small bits of DNA fragments linked to various diseases.
rhodopsin a light-sensitive pigment of the eye that functions in the detection of light.
ribonucleic acid see RNA.

Gene mutations, cancer, gonadal mosaicism and sporadics, polymorphisms, allelic and locus heterogeneity, VNTRs, STRs
Cell Cycle, Mitosis and Meiosis and Non Disjunction
P 112-121 T Ch 2, 9 ...

SNP: an abbreviation for 'single nucleotide polymorphism', pronounced "snip". A SNP that distinguishes two sequences can be used as a genetic marker.

Database of Genomic Structural Variation (dbVar)
Database of Genotypes and Phenotypes (dbGaP)
Database of Single Nucleotide Polymorphisms (dbSNP)
SNP Submission Tool
All Variation Resources...

RFLPRestriction fragment length polymorphism. A difference in restriction fragment length between individuals due to loss or gain of a restriction enzyme site due to point mutation, or insertion or deletion between consecutive sites. Normally detected by Southern blotting and probing.

RFLP -- restriction fragment length polymorphism; variations occurring within a species in the length of DNA fragments generated by a species endonuclease. Ribosomal protein -- one of the ribonucleoprotein particles that are the sites of translation.

See also: See also: DNA, Sequence, Gene, Nucleotide, Trans

Biology  Polymorphic loci  Polymorphisms

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