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  • heterochromatin  (1)
  • karyology  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Multiple-chromosome sex systems in the darkling beetles Blaps gigas and Blaps gibba (Coleoptera, Tenebrionidae) (1996)
    Springer
    Genetica 97 (1996), S. 225-233 
    Details
    ISSN: 1573-6857
    Keywords: karyology ; banded chromosomes ; Coleoptera ; darkling beetles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We have studied mitotic and meiotic chromosomes in the males of two species of Blaps: B. gigas and B. gibba. Karyological characteristics such as the occurrence of a multivalent configuration at diakinesis and two types of metaphase-II spreads support the notion that multiple-chromosome sex systems involving five chromosomes in B. gigas and eight chromosomes in B. gibba have developed in these species. Results obtained by means of silver staining and C-banding techniques suggest that the complex sex systems occurring in B. gigas and B. gibba may have originated from exchanges of terminal ribosomal genes among the Y chromosome and some autosomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00054629
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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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