Cytogenetics of the parthenogenetic grasshopper Warramaba virgo and its bisexual relatives. VIII. Karyotypes and C-banding patterns in the clones of W. virgo.
Eleven cytological clones of the parthenogenetic grasshopper Warramaba virgo are defined in this paper on the basis of their karyotypes and the C-banding patterns of their chromosomes. These clones are additional to the 16 clones previously described. Seven of the new clones have the standard karyotype and differ only in minor features of the C-bands, the result of amplification or diminution of heterochromatic segments. The remaining 4 clones carry translocations. Of the total of 27 clones of W. virgo now known, 9 carry translocations or fusions. The X + A chromosome is involved in five of these rearrangements and the 1(169) chromosome in four, suggesting a marked nonrandomness with regard to involvement in rearrangements. All the clones with translocations or fusions are known from single localities, suggesting that they are short-lived and do not spread far from their point of origin. A clone that apparently carries a paracentric inversion in one chromosome is more widespread. Clonal diversity in W. virgo seems to be maximal in the Kalgoorlie region of Western Australia, where W. virgo is believed to have arisen, on two separate occasions, by hybridization between two bisexual species. A classification of the clones on the basis of their C-banding patterns is tentatively proposed.
D000818:Animals; D001315:Australia; D005075:Biological Evolution; D002871:Chromosome Banding; D002875:Chromosomes / Q000648:ultrastructure*; D012734:Disorders of Sex Development; D006110:Grasshoppers / Q000235:genetics*; D006824:Hybridization, Genetic; D007621:Karyotyping; D010312:Parthenogenesis; D014178:Translocation, Genetic