Most of any one person’s DNA, about 99.9 percent, is exactly the same as any unrelated person’s DNA. The human genome contains about 3 billion bases of DNA and almost every cell in the body contains a copy. Differences in the sequence of DNA among individuals are called genetic variation. Genetic variation explains some of the differences among people, such as eye color and blood type. Genetic variation also plays a role in whether a person has a higher or lower risk for getting particular diseases.
> SNP Variation
> SNPs & Disease
> Functional Variation