Average heterozygosity is a measure of the genetic variability within a population, being the average population of organisms that are heterozygous for a specified set of gene loci.
The calculation of heterozygosity can be done directly by adding the frequency of the three heterozygote classes directly.
Or the calculation of heterozygosity can be done by adding the frequency of the three homozygote classes and subtracting the total from unity.
Average heterozygosity is a measure of the genetic diversity at the population scale and indicates the average proportion of individuals that are heterozygous for a given trait.