Vulpes fulva (American red fox)
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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- 1).Wodsedalek, J.E.: Spermatogenesis of the red fox, Vulpes fulvus. Anat. Rec. Suppl. 51:70, 1931.Google Scholar
- 4).Makino, S.: Notes on the chromosomes of four species of small mammals. (Chromosome studies in domestic mammals, V) J. Fac. Sci. Hokkaido Univ. Ser. IV. 9::345, 1947.Google Scholar
- 10).Moore, Jr., W. and Elder, R.L.: Chromosomes of the fox. J. Hered. 56; 142, 1965.Google Scholar
- 12).Sasaki, M., Shimba, H., Itoh, M., Makino, S., Hattori, K. and Shioto, G.: A preliminary note on the chromosome polymorphism in the fox. Proc. Japan Acad. 44:847, 1968.Google Scholar
- 17).Konstantinova, B. and Kasabov, L.L.: Cytogenetic studies in the fox. Mammalian Chromosomes Newsletter 13:78, 1972.Google Scholar