Karyotypic analysis of the cotton boll weevil, Anthonomus grandis Boheman
The diploid chromosome number of the cotton boll weevil, Anthonomus grandis Boheman, is 44. Both C- and N-banding techniques of mitotic cells demonstrated constitutive heterochromatin in the p arm of the eight largest chromosomes, the p arm of the X chromosome, and the centromeric region of autosomal groups A-D. Neither the y nor the group E autosomes appeared to contain constitutive heterochromatin. Supernumerary chromosomes were not found in the boll weevil. Restriction endonuclease banding of primary spermatocytes revealed a rod-shaped Xy tetrad in which the X and y were terminally associated. The p arm of the large, submetacentric X was C-band positive. While two of the autosomal tetrads were typically ring-shaped in primary spermatocytes, the remaining 19 autosomal tetrads were rod-shaped.
McNally, L., Beck, M., & Biggers, C. (2000). Karyotypic analysis of the cotton boll weevil, Anthonomus grandis Boheman. Genetica, 109 (3), 219-225. https://doi.org/10.1023/A:1017573403380