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The Journal of Heredity 2000:91(2)
© 2000 The American Genetic Association 91:168-170

Brief communication. Chromosome evolution of the blue sheep/bharal (Pseudois nayaur)

TD Bunch1,*, S Wang1, Y Zhang2, A Liu2, and S Lin2

1Department of Animal, Dairy and Veterinary Sciences, Utah State University, Logan, Utah 84322-4815, USA 2Key Laboratory of Cellular and Molecular Evolution, Kunming Institute of Zoology, Chinese Academy of Science, Kunming, Yunnan, PRC *Corresponding author E-mail: tombunch@cc.usu.edu

A male dwarf blue sheep was collected 60 km south of Batang east to the Jinsha Jiang river, and a male Subei blue sheep (Greater from) was collected from Gansu, China, representing two geographically separated blue sheep forms. Chromosome preparations were prepared from fibroblast cultures. The dwarf blue sheep has a 2n=54 and a karyotype with three biarmed formations that resulted from acrocentric chromosome fusions (based on the 2n=60 Capra autosomal equivalents) 14p/5q, 27p/1q,and 29p/2q from the largest to the smallest biarmed chromosome, respectively. The 14p/5q fusion is metacentric, whereas the 27p/1q and 29p/2q are submetacentric. The Subei blue sheep had a 2n = 56, with only the 27p/1q and 29p/2q biarmed chromosome fusions. The remainder of the chromosomes in both blue sheep are acrocentric; the X is the largest acrocentric chromosome and the Y is a minute biarmed chromosome. Our observation is one evidence showing that chromosome evolution within blue sheep has followed a series of centric fusions resulting in the reduction of chromosome number, which is typical of all extant genera within the tribe Caprini.


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