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The high variability of the chromosome number observed in the early embryonic stages of the insect Bacillus rossius and the need for karyological comparisons of different populations have suggested a study of its karyotype. The analysis of mitotic divisions in the spermatogonia and of meiotic metaphases I, have shown that the basic chromosome set of the male is made up of two large metacentrics, three medium sized telocentrics (a pair of autosomes plus a single X chromosome), and of fifteen pairs...
Seven males of the stick insect B. rossius (out of the twenty collected on the Isola del Giglio in July 1974) have shown a chromosomal rearrangement of a definite kind in all the spermatogonia and spermatocytes I which could be analysed in spite of extensive stickiness. Five of them had a pericentric inversion affecting one of the medium sized autosomes (4 heterozygotes and 1 homozygote); this chromosomal rearrangement appears to be the same in the 5 specimens. For one of the heterozygotes it has...
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