[Frequency of chromosome aberrations in residents of the Semipalatinsk Oblast]. / Chastota aberratsii khromosom u zhitelei Semipalatinskoi oblasti.

Cytogenetic analysis of the population of the Beskaragai district of the Semipalatinsk oblast adjacent to the territory of the nuclear test site was conducted by means of an ecological genetic questionnaire and cytogenetic examination of metaphase chromosomes. An increase in the total mutation level in the region was observed. The frequency of chromosome aberrations among the population of the Beskaragai district (3.2%) was statistically significantly (about 1.5 times) higher than the background levels in the clear regions (from 1 to 2%). Furthermore, the frequency of aberrations in adolescents was comparable with that in the adults. The spectrum of chromosome aberrations pointed to a significant contribution of radiation component to the mutagenesis.

[Translocation of chromosome 1/29 and its various phenotypic manifestations in Ala-Tau breed cattle]. / Translokatsiia khromosomy 1/29 i ee nekotorye fenotipicheskie proiavleniia u skota ala-tau porody.

117 heads of Ala-Tau breed cattle were studied cytogenetically. The 1/29 translocation was present in 13 animals of unusual for this breed light-grey colour. Chimerism 2n = 59/2n = 60 was found in twins. Dominant mutation transforming dark brown colour to the light-grey seemed to be present in the 1/29 chromosome locus, near the centromere region.