Multiple-chromosome sex systems in the darkling beetles Blaps gigas and Blaps gibba (Coleoptera, Tenebrionidae) |
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Authors: | R. Vitturi E. Catalano I. Sparacio M. S. Colomba A. Morello |
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Affiliation: | (1) Institute of Zoology, University of Palermo, Via Archirafi 18, 90123 Palermo, Italy |
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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. |
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Keywords: | karyology banded chromosomes Coleoptera darkling beetles |
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