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Variation of C-bands in the chromosomes of several subspecies of Rattus rattus

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Abstract

All subspecies of black rats,(Rattus rattus) used in the present study are characterized by having large and clear C-bands at the centromeric region. The appearance of the bands, however, is different in the subspecies. Chromosome pair No. 1 in Asian type black rats (2n=42), which are characterized by an acrocentric and subtelocentric polymorphism, showed C-band polymorphism. In Philippine rats,(R. rattus mindanensis) the pair was subtelocentric with C-bands, but in Malayan black rats,(R. rattus diardii) it was usually acrocentric with C-bands. In Hong-Kong,(R. rattus flavipectus) and Japanese black rats,(R. rattus tanezumi) it was polymorphic with respect to the presence of acrocentrics with C-bands or subtelocentrics without C-bands. The other chromosome pairs showed clear C-bands, but in Hong-Kong black rats the pairs No. 2 and 5 were polymorphic with and without C-bands. In Japanese black rats, 6 chromosome pairs (No. 3, 4, 7, 9, 11 and 13) were polymorphic in regard to presence and absence of C-bands, but the other 5 chromosome pairs (No. 2, 5, 6, 8 and 10) showed always absence of C-bands. Only pair No. 12 usually showed C-bands. C-bands in small metacentric pairs (No. 14 to 20) in Asian type black rats were generally large in size, but those in the Oceanian (2n=38) and Ceylon type black rats (2n=40) were small. In the hybrids between Asian and Oceanian type rats, heteromorphic C-bands, one large and the other small, were observed. Based on the consideration of karyotype evolution in the black rats, the C-band is suggested to have a tendency toward the diminution as far as the related species are concerned.

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  1. National Institute of Genetics, Misima, Japan

    Tosihide H. Yosida & Tomoko Sagai

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  1. Tosihide H. Yosida
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  2. Tomoko Sagai
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Yosida, T.H., Sagai, T. Variation of C-bands in the chromosomes of several subspecies of Rattus rattus . Chromosoma 50, 283–300 (1975). https://doi.org/10.1007/BF00283472

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  • DOI: https://doi.org/10.1007/BF00283472

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