Multiple-chromosome sex systems in the darkling beetlesBlaps gigasandBlaps gibba(Coleoptera, Tenebrionidae)
✍ Scribed by R. Vitturi; E. Catalano; I. Sparacio; M. S. Colomba; A. Morello
- Publisher
- Springer Netherlands
- Year
- 1996
- Tongue
- English
- Weight
- 664 KB
- Volume
- 97
- Category
- Article
- ISSN
- 0016-6707
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✦ Synopsis
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.