Journal of Insect Biotechnology and Sericology
Online ISSN : 1884-7978
Print ISSN : 1346-8073
ISSN-L : 1346-8073
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Regular Article
  • Non-directional pairing of the WZ chromosome bivalent in Bombyx mori
    Toshiaki Fujimoto, Susumu Katsuma, Ken Sahara
    2025 Volume 94 Issue 2 Pages 2_019-2_022
    Published: 2025
    Released on J-STAGE: June 16, 2025
    DOIhttps://doi.org/10.11416/jibs.94.2_019
    JOURNAL FREE ACCESS
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     The silkworm Bombyx mori carries a holokinetic (holocentric) chromosome and has a female heterogametic sex determination system (WZ/ZZ chromosomes, female/male). Homologous chromosomes form directional synaptonemal complexes during primary meiosis. The WZ sex chromosomes have a bivalent form; however, the direction of their pairing has long been unknown. In this study, our fluorescence in situ hybridization-based analysis revealed that the W and Z chromosomes form a non-directional bivalent during primary meiosis.

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