| taxonomic problems in the drosophila melanica species group (diptera: drosophilidae) from southern china, with special reference to karyotypes and reproductive isolation. | karyotypes and reproductive isolation were studied in two allopatric populations of drosophila tsigana, one from guizhou province in southern china and the other from hokkaido in northern japan, and in one population of a closely related species, d. longiserrata, from guizhou. in metaphase plates of larval brain cells, both geographic strains of drosophila tsigana showed 2n=10 chromosomes, with 2 pairs of metacentric (v-shape), 2 pairs of acrocentric (r-shape), and 1 pair of dot-liked (d-shape) ... | 2006 | 17116996 |