Rattus rattus (Black rat)
As we now know, there are two basic chromosome numbers for R. >rattus, one 42 (Folio 229) and the other 38. Apparently Robertsonian processes were involved in the establishment of the two karyotypes (3). Data are rapidly accumulating in regard to the distribution of these two basic numbers over the globe.
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- 2).Satya Prakash, K.L. and Aswathanarayana, N.V.: A preliminary note on the occurrence of supernumerary (B-) chromosome in the 38-chromosome taxon of Rattus rattus. Mammalian Chromosomes Newsletter 13:117, 1972.Google Scholar
- 3).Yosida, T.H. and Sagai, T.: Banding pattern analysis of polymorphic karyotypes in the black rat by a new differential staining technique. Chromosoma 27:387, 1972.Google Scholar
- 4).Mostashfi, P., Rahmani, T., Mostashfi, H. and Yazdani, F.: Chromosomes of Rattus rattus in Iran. Mammalian Chromosomes Newsletter 13:149, 1972.Google Scholar