Relationships between genes and probing populations for variations in the genetic code that may increase one's risk for a particular disease or determine one's response to a given medication.

A change of a single base in a genetic sequence that is present in at least 1% of the population for a specific gene, e.g., the substitution of an A for a G in gene X.

A change in a single nucleotide (A, T, C, or G) in a gene sequence causing a change in expression of the gene in the individual's phenotype.

(SNPs) Common, but minute, variations that occur in human DNA at a frequency of one every 1,000 bases. These variations can be used to track inheritance in families. SNP is pronounced "snip".

DNA sequence variations that occur at single nucleotide (A,T,C,or G).

Individual pairs of nucleotides or bases that are different in two individuals of a given species are called SNPs. They can result in a genetically based disease or a changed susceptibility to drugs and can be used to identify genetically based diseases.

sites in the human genome where individuals differ in their DNA sequence. These variations can be used to track inheritance in families.

(SNPs) - A single base pair difference in a DNA sequence shared among individuals.

(SNPs) are the most common type of genetic variation. SNPs are stable mutations consisting of a change at a single base in a DNA molecule. SNPs can be detected by HTP analyses, for instance with DNA chips, and they are then mapped by DNA sequencing.

Pronounced “snip”. A variation in a single DNA nucleotide or code (recipe) for a protein. Most of the variation in people is due to SNPs There are millions of these in humans. However, only certain SNPs are functional, i.e., associated with a difference in molecular function significant enough to effect clinical measurements and risk of disease. Numbers are used to identify the chromosomal locations of SNPs and hetero - or homozygosity.