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  • Diplopoda  (1)
  • goby  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Molecular and Cytogenetic Analysis of the Goby Gobius Niger (Teleostei, Gobiidae) (2000)
    Springer
    Genetica 110 (2000), S. 73-78 
    Details
    ISSN: 1573-6857
    Keywords: goby ; rDNA genes ; repetitive DNA ; transposable elements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A molecular cytogenetic study of Gobius niger has been conducted by treating its mitotic chromosomes with silver-, CMA3- and DAPI-staining and fluorescent in situ hybridization using four multicopy or repetitive DNAs (the 28S and 5S rDNAs, the TTAGGG telomeric repeat and the mariner-like elements) as probes. In particular, the study proved the presence of NOR heteromorphism and suggested the possible role of the transposable element mariner in its genesis. In situ hybridization with the 5S rDNA probe proved the presence of just one 5S-bringing chromosome pair, whereas hybridization with the telomeric repeat revealed small bright hybridization spots, uniform in size and intensity, on each telomere of all chromosomes but no interstitial signals were noticed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017547005143
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  • 2
    Electronic Resource
    Electronic Resource
    High heterochromatin content in somatic chromosomes of two unrelated species of Diplopoda (Myriapoda) (1997)
    Springer
    Chromosome research 5 (1997), S. 407-412 
    Details
    ISSN: 1573-6849
    Keywords: Acanthopetalum sicanum ; chromosome banding ; Diplopoda ; Enologus oxypygum ; heterochromatin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract For the first time, a conventional analysis of C-banded karyotypes was carried out in two distantly related diplopod species; this revealed an impressive percentage of heterochromatin in both genomes. In Acanthopetalum sicanum (Order Callipodida) (2n = 12), heterochromatin constitutes about 60% of the total DNA in females and 56% in males, whereas in Enologus oxypygum (Order Julida) (2n = 22) it is about 67% in both sexes. Heterochromatin of the two species was found to be similar in base composition (AT rich) and heterochromatin distribution, indicating that it has accumulated in a species-specific manner. Sex-determining mechanisms of the XY type were detected in both A. sicanum and E. oxypygum. In A. sicanum, the Y presented the lowest heterochromatic content of all chromosomes in the karyotype, whereas the X presented the highest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018400510064
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