Four DNA polymorphisms on the short arm of the X chromosome: allele frequencies in a German and in a Turkish population.

Four restriction fragment length polymorphisms, revealed by cloned arbitrary X chromosome segments (L1.28, RC8, pD2, 754) were studied in samples (50 individuals each) of a German and a Turkish population. All previously reported alleles of these polymorphisms were found in both populations, except the infrequent RC8 allele B3 (3.0 kb fragment), which was absent in both groups. The observed minor alleles were found to be rarer in the German series than in the Turkish group, but there was no conclusive evidence of essentially different allele frequencies in either population. However, the frequencies of the RC8 allele B2 (5.3 kb fragment) were differing at the 5% significance level. The allele frequencies of the four polymorphisms are presented and compared with those reported from other European regions.