Heteromorphism of rDNA Size in Pinirampus pirinampu (Pisces: Pimelodidae) Detected by in situ Hybridization.

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• The ribosomal RNA genes of <I>Pinirampus pirinampu</I> have been localized by fluorescence <I>in situ</I> Hybridization hybridization (FISH) with 18S rDNA probe. This method allowed the location of FITC signals on the short arm of the biggest subtelocentric chromossomic pair and evidenced a size heteromorphism of hybridization signals between homologous chromosomes. This difference has been attributed to variation in the amount of rRNA genes per cluster, probably due structural modifications (<I>i.e</I>. duplications by unequal crossing over or transpositions) of NOR involving homologous segments.

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