Abstract
Electron microscopy analysis of the synaptonemal complex was carried out for the first time in Cricetulus barabensis pseudogriseus, fertile F1 hybrids of C. b. pseudogriseus × C. b. griseus, C. b. griseus × C. b. barabensis, and back-cross hybrids C. b. pseudogriseus × (F1 C. b. pseudogriseus × C. b. griseus). Meiotic disturbances were identified in the nuclei of single hybrid spermatocytes, including atypical synapsis, associations of autosomes with a sex bivalent, and sex body formation errors. Our study confirms the results of the molecular genetic and craniometric analysis of these forms. Despite the geographical segregation, three chromosomal forms of Cricetulus barabensis complex do not establish reliable cytogenetic barriers.
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