Article 16219

Title of the article



Skorinov Dmitriy Vladimirovich, Candidate of biological sciences, researcher, laboratory of chromosome stability and cell engineering, Institute of Cytology of RAS (4 Tikhoretskiy avenue, Saint-Petersburg, Russia), E-mail:
Pasynkova Roza Abramovna, Junior researcher, laboratory of chromosome stability and cell engineering, Institute of Cytology of RAS (4 Tikhoretskiy avenue, Saint-Petersburg, Russia), E-mail:
Litvinchuk Spartak Nikolaevich, Candidate of biological sciences, senior researcher, laboratory of chromosome stability and cell engineering, Institute of Cytology of RAS (4 Tikhoretskiy avenue, Saint-Petersburg, Russia), E-mail: 

Index UDK

597.6/.9: 576.316.23 




Background. The aim of the work was to study the heteromorphism of nucleolar organizers (NORs) and its correlations with sex chromosomes in different species of Anura.
Materials and methods. NORs in karyotypes of 57 species of tailless amphibians (6 families, 14 genera) were studied. In karyotypes, we analyzed a number of NORs on each chromosome and their total number in the diploid set of chromosomes, size, shape and position of NORs on chromosomes.
Results. Heteromorphy in size and form of NORs was revealed in all studied species. Among species, which were represented in our study by both sexes, 70 % (14 species) had heteromorphic NORs which were unrelated to sex. In the remaining 30 %, only males or only females had heteromorphic NORs. As a rule, NORs were found in a single pair of homologous chromosomes. Additional NORs were extremely rare.
Conclusions. Heteromorphic NOR-bearing chromosomes can be autosomes or sexual ones. 

Key words

Amphibia, nucleolar organizer, sex chromosomes 


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Дата создания: 10.10.2019 15:01
Дата обновления: 15.10.2019 15:40