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Journal of Applied Genetics 42(4), 2001, pp. 493-501

Comparison of the Nuclear Organiser Region activity in four taxa of the family Canidae


Abstract: Four species of the family Canidae were cytogenetically studied. The activity of NORs was detected with the use of silver staining. The number of NORs was characteristic for a given karyotype. For the dog found on autosomes 7, 17, 20 and on sex chromosome (Y), for the racoon dog on autosomes 1, 4, 13 and on sex chromosome (Y), for the silver fox only on autosomes 8, 9, 13 and for the blue fox on autosomes 13, 15, 17, 18, 20 and 22. The results demonstrate that NOR activity is similar in all the analysed species of the Canidae. Simultaneously, NOR activity for a medium-sized chromosome pair is distinctly higher than for two other autosome pairs (the longest and the smallest pair). Considerable variability was observed within individuals.

Key words: Canidae, NOR activity.

Correspondence: M. ZAGALSKA, Department of Genetics and Animal Breeding, Agricultural University of Poznan, ul. Wolynska 33, 60-637 Poznan, Poland, e-mail: