Chapter

Nucleolar Activity and Distribution of Ribosomal Genes in Phyllotis Rodent Species and their Laboratory Hybrids

Laura I. Walker and Sergio V. Flores

in The Quintessential Naturalist

Published by University of California Press

Published in print July 2007 | ISBN: 9780520098596
Published online March 2012 | e-ISBN: 9780520916159 | DOI: http://dx.doi.org/10.1525/california/9780520098596.003.0027
Nucleolar Activity and Distribution of Ribosomal Genes in Phyllotis Rodent Species and their Laboratory Hybrids

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This chapter studies the expression of nucleolar organizer regions (NORs), distinguished through silver staining procedures, and the distribution of ribosomal genes, detected by fluorescent in situ hybridization with a ribosomal DNA probe, in Phyllotis rodent species and their laboratory generated hybrids. It notes that in the hybrids between the more genetically distant species, the NORs of one parental genome were preferentially expressed. The chapter explains that this result differs from the codominant rDNA expression previously detected in hybrids between the two more genetically similar of the three species, and suggests that nucleolar dominance is related to the compatibility of parental genomes.

Keywords: nucleolar organizer regions; silver staining procedures; ribosomal genes; in situ hybridization; Phyllotis rodent; codominant rDNA expression; parental genomes

Chapter.  5550 words.  Illustrated.

Subjects: Zoology and Animal Sciences

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