How genes work together to shape how much you smoke
Take a puff of nicotine for the first time, and your DNA plays an important role, alongside social and environmental factors, in shaping what happens next.
Mar 27, 2024
0
1
Take a puff of nicotine for the first time, and your DNA plays an important role, alongside social and environmental factors, in shaping what happens next.
Mar 27, 2024
0
1
A single-nucleotide polymorphism (SNP, pronounced snip) 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 species (or between paired chromosomes in an individual). 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 : C and T. Almost all common SNPs have only two alleles.
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[1]. 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.
This text uses material from Wikipedia, licensed under CC BY-SA