Frequency distribution of D1S80 (MCT118) locus polymorphism in a Qatari population.

: The genotype and allele frequencies at the D1S80 locus were determined in a Qatari population sample (n = 300) using the polymerase chain reaction with subsequent electrophoretic separation of the amplified DNA fragments. Twenty-two different alleles containing 15-39 repeats of the basic 16-bp unit and 78 genotypes were distinguished; the alleles with 18 and 24 repeat units were the most common, with frequencies of 0.2117 and 0.4233, respectively. The observed and expected genotype values show no significant deviation from Hardy-Weinberg equilibrium. The power of discrimination for the D1S80 locus in the Qatari population is 0.9137, and the chance of exclusion is 59.01%.