B chromosomes (Bs) have been found in 55 out of 4629 living species of mammals. The
summarized data show great variability in types of mammalian Bs, including differences in …

The additional or B-chromosomes (B's) and polymorphism for them are widely known in
plants and invertebrates (MuNTZING 1958; BATTAGLIA 1964; JoNES 1975). Different B's …

B chromosomes (B s) are supernumerary chromosomes that vary in number among
individuals of the same species. Because of their dispensable nature, their non‐M endelian …

The chromosome complements of 188 specimens of 29 species of Australian murid rodents
belonging to the subfamilies Pseudomyinae and Hydromyinae and the Uromys/Melomys …

All subspecies of black rats,(Rattus rattus) used in the present study are characterized by
having large and clear C-bands at the centromeric region. The appearance of the bands …

A total of 219 wild caught specimens representing 12 of the currently recognised 13 species
and subspecies of Australian Rattus have been karyotyped. No two species possessed …

Ten individuals of Uromys caudimaculatus sampled from Queensland gave evidence for the
occurrence of two distinct chromosome races characterised by marked differences in their …

Supernumerary chromosomes have been examined in 352 black rats, covering three
geographic variants, by use of conventional and C-band staining techniques. Metacentric …

The arm number hypothesis proposed by Brewen and colleagues in 1973 has been
examined in the light of information thus far available from mammalian studies. In …

Chromosomes were analyzed in 91 specimens of Nectomys squamipes, collected in three
distinct geographic regions of Brazil. Chromosomal polymorphism due to supernumerary …