Chromosomal complements of five species of Indian mammals

The chromosomal complements of five species of mammals, Mus musculus (Linn.), Rattus rattus rattus (Linn.), Bandicota bengalensis (Gray and Hardw.), Funambulus pennanti (Wr.) and Lepus ruficaudatus (Geoff.) were elaborated. The karyotypes of all the species were compared. The diploid number (2n) in Mus is 40, Rattus 42, Bandicota 42, Funambulus 54 and Lepus 48. An extra large X-chromosome was observed in one population of male Rattus rattus rattus (Linn.), which might have been formed as a result of duplication of the terminal segments of both the arms of the chromosomes.