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| Name | Single nucleotide polymorphism SNP |
| Video Uploader | Video From Shomu's Biology |
| Upload Date | This Video Uploaded At 04-11-2013 13:19:11 |
| Video Discription | For more information, log on to- http://shomusbiology.weebly.com/ Download the study materials here- http://shomusbiology.weebly.com/bio-materials.html A single-nucleotide polymorphism (SNP, pronounced snip; plural snips) is a DNA sequence variation occurring when a single nucleotide — A, T, C or G — in the genome (or other shared sequence) differs between members of a biological species or paired chromosomes in a human. For example, two sequenced DNA fragments from different individuals, AAGCCTA to AAGCTTA, contain a difference in a single nucleotide. In this case we say that there are two alleles. Almost all common SNPs have only two alleles. The genomic distribution of SNPs is not homogenous; SNPs usually occur in non-coding regions more frequently than in coding regions or, in general, where natural selection is acting and fixating the allele of the SNP that constitutes the most favorable genetic adaptation.[1] Other factors, like genetic recombination and mutation rate, can also determine SNP density.[2] SNP density can be predicted by the presence of microsatellites: AT microsatellites in particular are potent predictors of SNP density, with long (AT)(n) repeat tracts tending to be found in regions of significantly reduced SNP density and low GC content.[3] Within a population, SNPs can be assigned a minor allele frequency — the lowest allele frequency at a locus that is observed in a particular population. This is simply the lesser of the two allele frequencies for single-nucleotide polymorphisms. There are variations between human populations, so a SNP allele that is common in one geographical or ethnic group may be much rarer in another. These genetic variations between individuals (particularly in non-coding parts of the genome) are exploited in DNA fingerprinting, which is used in forensic science . Also, these genetic variations underlie differences in our susceptibility to disease. The severity of illness and the way our body responds to treatments are also manifestations of genetic variations. For example, a single base mutation in the APOE (apolipoprotein E) gene is associated with a higher risk for Alzheimer disease.[4] Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers. Link- http://en.wikipedia.org/wiki/Main_Page DE9b1dxy_pE |
| Category | Education |
| Tags | cell biology | Dna Fingerprint | Sslp | Microsattelite | Aflp | Gene Expression Profile | Dna Sequencing | Restriction Enzyme | proteins | Repetitive Dna | Rflp | suman bhattacharjee | teaching | DNA | life sciences | Snp Profiling | Minisattelite Dna | Dna Fingerprinting | Issr | Simple Sequence Length Polymorphism | biology education | Snp | Ssr | molecular biology | Gene Profiling | Simple Sequence Repeats | Single Nucleotide Polymorphism | shomu's biology | Inter Simple Sequence Repeat |
