Rattus rattus (Black rat)

2n = 38
  • T. C. Hsu
  • Kurt Benirschke


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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  1. 1).
    Bianchi, N.O., Paulette-Vanrell, J. and Rioja, V.: Complement with 38 chromosomes in two South American populations of Rattus rattus. Experientia 25 : 1111, 1969.PubMedCrossRefGoogle Scholar
  2. 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. 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. 4).
    Mostashfi, P., Rahmani, T., Mostashfi, H. and Yazdani, F.: Chromosomes of Rattus rattus in Iran. Mammalian Chromosomes Newsletter 13:149, 1972.Google Scholar

Copyright information

© Springer Science+Business Media New York 1973

Authors and Affiliations

  • T. C. Hsu
    • 1
  • Kurt Benirschke
    • 2
  1. 1.Section of Cytology, Department of BiologyThe University of Texas M. D. Anderson Hospital and Tumor InstituteHoustonUSA
  2. 2.Department of Obstetrics & Gynecology, School of MedicineUniversity of CaliforniaSan Diego, La JollaUSA

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