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Quantitative and qualitative studies of the DNA evolution in Chondrichthyes (Selachians).
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Genome size of some selachian fishes
No full textThe nuclear DNA content of 23 chondrich- thyan species (9 Squalomorphii, 11 Batoidea and 3 Galeomorphii) has been studied. Their genome size ranged from 5.4 pg/N in Raja clavata (Batoidea) to 32.3 pg in Ëtmoplerus spinax (Squalomorphii). The lowest values so far recorded for selachians have been reported within the Batoidea, with a slight interspecific variability at the intrafamilial level. In contrast, the Squalomorphii displayed a high DNA content, with values mostly above those of all the other selachians hitherto assayed, and with a wide interspecific variability at the intrafamilial level. The results are discussed in relation to the data for other Chondrichthyes, and comparison is made with the genome size in other vertebrate classes. © 1980 Taylor and Francis Group, LLC
Ibridazione in situ fluorescente (FISH) di sequenze telomeriche (TTAGGG)n su cromosomi di Selaci
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Genome characteristics and the systematics of the discoglossidae (amphibia salientia)
No full textA comparison has been performed among chromosome sets, genome sizes and DNA fractions characterized by a different repetitivity of the nucleotide sequences in two species of Alytes, one of Discoglossus and one of Bombina (family of Discoglossidae; Amphibia Salientia). Alytes appears as the karyologically less differentiated genus, whereas Bombina distinguishes itself by the sizes of genome and of single-copy fraction, larger than in other discoglossids and outstanding also with respect to the other anurans so far studied; Discoglossus has a karyotype with characteristics transitional between those of the other two genera, but showing a greater complexity in the middle repetitive fraction. These anurans are, therefore, rather heterogeneous and different from one another from the viewpoint of their chromosome morphology and quantitative and qualitative DNA characteristics, so that it is not possible to determine a closer relationship between two of these genera with respect to the third. © 1982 Taylor & Francis Group, LLC
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