*H: heterozygocity rate. (H = 1 - 931;pi2); pi – frequency of allele i. **The sequence containing the Xba I polymorphic site is located in the 9,5 kb repeated region of intron 22. Thus, flanking primers amplify together with the Xba I polymorphic site a fragment in the extragenic copies that usually lack the Xba I restriction site and, practically, genotypes +/+ cannot be distinguished of genotype +/-. Thus, genotype of a female must be inferred of the genotype of her children .