Identification of the Z-W bivalent in the silkworm,Bombyx mori |
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| Authors: | N. Kawamura T. Niino |
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| Affiliation: | (1) Laboratory of Sericology, Faculty of Agriculture, Hokkaido University, N-9, W-9, Kita-ku, 060 Sapporo, Hokkaido, Japan;(2) Department of Genetic Resources II, National Institute of Agrobiological Resources, Tohkamachi, 6000 Shinjo, Yamagata, 996, Japan |
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| Abstract: | None of the 56 chromosomes including sex chromosomes have been identified in the silkworm so far, though the 28 linkage groups have been determined (Doira, 1986). The present study aims to demonstrate the sex chromosome bivalent in the oocyte by using a particular strain, the sex-limited yellow cocoon (Sy), in which a large fragment of the second chromosome was translocated onto the W chromosome. Among 28 bivalents in the oocyte of the Sy strain, an asymmetrical synaptonemal complex was observed, while in the oocyte of the control strains no such complex was found. We consider this complex as the Z-W bivalent in the silkworm. |
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