Rare and unusual alleles in Alaskan ethnic groups.

Frequencies of AK31, AK61, UMPK2, DPGM2, GOT2S, GOT3S, PGP2, RDS2, PGDc, DIA4, NP2 and PEPB6 in 18 language groups were estimated. Four of these alleles occurred in only a single group, but the rest were found in no systematic way in several. The results suggest that some of the alleles were present in early ancestors of these groups, but have disappeared from many of them because of the small size of the groups and their lack of contact with one another.