[High frequency of subtotal deletion of the Y-chromosome hetero-chromatin in Khanty from the lower Ob River area].

High frequency of the Y chromosome heterochromatin subtotal deletion, del(Y) (q12) has been detected in the course of cytogenetic study of Khanty from the lower Ob river in West Siberia. This deletion was found in 32 out of 154 males examined, i.e. in 20.8%. Taking into account a small size and a long distance isolation of the population, it has been concluded that the high frequency of the del(Y) (q12) is caused by genetic drift of the marker chromosome.