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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.
Other Resources ...

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 involves one of two or more variants of a particular DNA sequence. The most common type of polymorphism involves variation at a single base pair.

Polymorphism in the immune system
Immune system genes are exceptionally polymorphic, reflecting in part selection by diverse and rapidly varying pathogens, ...

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

TAG: Restriction fragment length polymorphism
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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 /PAWL-ee-MORE-fiz-əm/ n. The existence of two or more distinct genetic variants within a population; usually refers to variation at a particular locus.

Polymorphisms. Variant forms of a particular gene that occur simultaneously in a population.
Polynucleotide. A DNA polymer composed of multiple nucleotides. (See Nucleotide.) ...

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.

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.

Genetic polymorphism: Presence of several genetically controlled variants in a population.

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)) ...

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.

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: ...

Sequence polymorphism differing in a single base pair.
Example for a single nucleotide substitution: ...

A type of polymorphism in which the frequencies of the coexisting forms do not change noticeably over many generations.
bark ...

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.

(See DNA polymorphism.) Alternative mRNA splicing. The inclusion or exclusion of different exons to form different mRNA transcripts. (See RNA.) Amino acid.

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.

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.

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 ...

SSLP Simple Sequence Length Polymorphisms (SSLPs) are markers that detect differences in the length of a PCR product.

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.

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.

restriction fragment length polymorphism (RFLP) A heritable difference in DNA fragment length and fragment number; passed from generation to generation in a codominant way.

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 ...

The markers where hybridization occurred are referred to as RFLPs (restriction-fragment-length polymorphisms). The longer fragment in sickle-cell individuals is interpreted as evidence of a mutation in the recognition sequence.

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.

The interspecific cross is carried out to take advantage of the high level of polymorphism between the two parents.
Intersubspecific cross
A cross between two subspecies.

See also: See also: DNA, Sequence, Gene, Chromosome, Organ

Biology  Polymorphic loci  Polymorphisms

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