Population genetics


For the top panel describing variation details such as source and class, see this help page.

Allele frequencies for specific populations are shown in this panel. Most of these data are imported through dbSNP.

Frequency tables

The populations studied and data sources (submitters) are shown in the first three columns. Allele and genotype frequencies are displayed in the next columns, followed by allele and genotype counts.

Allele frequencies: In this separate example, the alleles found in the Yoruba (YRI) HapMap population are C (a frequency of 0.175, or 17.5% of all alleles) and G (0.825 or 82.5%). The allele frequency is calculated by dividing one allele's count (C) by the number of alleles detected. In this case, the total allele count is 21(C) + 99(G), which adds up to 120 alleles. Therefore, the C allele has a frequency of 21/120, or 0.175.

Genotypes and counts: Genotypes detected in this population are C|C (a frequency of 0.017 or 1.7%), C|G (0.317 or 31.7%) and G|G (0.667 or 66.7%). Allele count represents the number of each type of allele found in the population studied. In the example above, out of 60 individuals (120 alleles), the allele C was found 21 times and allele G was detected 99 times.

In this example, the genotype count adds up to 60 individuals, and shows only one individual with the C|C genotype.