Vulpes fulva (American red fox)

2n = 34
  • T. C. Hsu
  • Kurt Benirschke


The karyotypes displayed are from kidney and fibroblast cultures of a study of two male and three female wild foxes (Grafton County, New Hampshire and Orange County, Vermont, USA) and one female red fox from a fox farm. Kidney cultures and bone marrow preparations gave similar results. The X was identified by radioautography. The majority of specimens and cells had some microchromosomes. Most often there were two but as many as seven were encountered. They are heterochromatic and can often be seen to be breaking off the end of any of the larger elements. They appear to possess no centromere and are held together presumably by telomeres. They appear in direct preparations as well as tissue cultures and no demonstrable difference is detected by visual comparison of karyotypes possessing several and those having no microchromosomes. The variable diploid number described for this species is the result of variation in the number of microchromosomes. In our animals no phenotypic differences were correlated to this variable. The autosomes are arranged in two groups, first the metacentrics and second the submetacentrics.


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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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