title: Ribosomal gene reiteration in a marsupial species with an X-linked nucleolar organizer.
abstract: The number of ribosomal cistrons in somatic cells of males and females of Macropus eugenii have been estimated using RNA/DNA hybridization in 70% (v/v) formamide. The male has one X-linked active nucleolar organizer and the female two and while the number of ribosomal cistrons is variable between the four males examined (31-65 copies), it is substantially less than the number present in the three females (94-103 copies). There is, therefore, no evidence of dosage compensation by amplification.
mesh_terms: D000818:Animals; D004303:Dosage Compensation, Genetic; D005260:Female; D005796:Genes; D007614:Macropodidae / Q000235:genetics*; D008297:Male; D008394:Marsupialia / Q000235:genetics*; D009693:Nucleic Acid Hybridization; D009697:Nucleolus Organizer Region / Q000032:analysis*; D012270:Ribosomes / Q000032:analysis*; D012737:Sex Factors; D014960:X Chromosome