Summary
In the parthenogenetic stick insectSipyloidea sipylus, an additional chromosome duplication takes place in the primary oocytes immediately after pachytene. After duplication, the chromosomes again appear in a pachytene configuration, and oogenesis proceeds with twice the somatic number of chromosomes. Additional duplication does not occur during prophase of primary spermatocytes.
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Pijnacker, L.P., Ferwerda, M.A. Additional chromosome duplication in female meiotic prophase ofSipyloidea sipylus Westwood (Insecta, Phasmida), and its absence in male meiosis. Experientia 34, 1558–1560 (1978). https://doi.org/10.1007/BF02034672
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DOI: https://doi.org/10.1007/BF02034672