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[Polymorphism of pericentromere heterochromatin of polytene chromosomes of ovarian trophocytes in natural populations of the malaria mosquito Anopheles messeae Fall].

Pericentric heterochromatin polymorphism in chromosome 2 of ovarian trophocytes was studied in three natural populations of the malaria mosquito Anopheles messeae Fall. It is shown that pericentric heterochromatin blocks occur in four different variants whose sizes are at the 1:2:3:4 ratio (single, double, triple, and quadruple blocks). Mosquitoes with homo- and heterozygous variants of these blocks were identified. By analyzing frequency distribution of different size variants, interpopulation differences in this parameter were revealed. Mosquitoes with double heterochromatin blocks prevailed in the southern population, whereas those with triple blocks were more abundant in the northern population.