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Autosomal polymorphism in laboratory bred and wild Norway rats, Rattus norvegicus, found in Misima
Polymorphism in chromosome pair no. 3 of Rattus norvegicus was found in laboratory strains and wild rats, and in inbred strains were classified into two types concerning the pairNo. Expand
Supernumerary chromosomes in the black rat (Rattus rattus) and their distribution in three geographic variants.
  • T. Yosida
  • Biology, Medicine
  • Cytogenetics and cell genetics
  • 1 July 1977
Findings suggested that the supernumeraries had originally developed in the Asian- type black rats and then were sequentially transmitted to the Ceylonese and Oceanian-type black rats, probably in southwestern Asia. Expand
Karyotypic differences of black rats, Rattus rattus, collected in various localities of East and Southeast Asia and Oceania
Karyotypes of several subspecies of black rats, Rattus rattus, collected in different localities of Asia and Oceania were examined with special emphasis on the relationship between the chromosomeExpand
Analyses of bromodeoxyuridine-associated sister chromatid exchanges (SCEs) in Bloom syndrome based on cell fusion: single and twin SCEs in endoreduplication.
These studies strongly suggest that most of the Bloom syndrome SCEs occur during the second cell cycle when BrdUrd-containing DNA is used as template for replication and that the normal level of BS SCE observed at the first mitosis of the hybrid cells is the result of SCE inhibition resulting from the fusion with normal cells. Expand
Variation of C-bands in the chromosomes of several subspecies of Rattus rattus
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. Expand
Cytogenetical studies on Insectivora.
It is suggested that the house shrews with 40 chromosomes should have distributed originally in India, and then migrated to Southwest, Southeast and East Asia, and the chromosome number reduction could have occurred in the animals moved to southern India and then they migrated to Sri Lanka. Expand
Karyological study of four Japanese Myotis bats (Chiroptera, Mammalia)
Karyological investigations of four Japanese Myotis species were made based on Gand C-banding pattern analysis and it was revealed that the four species have all 2n=44 and their karyotypes are, excepting one chromosome pair, identical each other. Expand
Cytogenetical Studies on Fishes. V
The chromosome-numbers of females in two dragonet fish species, Callionymus beniteguri and C. ornatipinnis, are thirty-eight (2n=38), all being subtelocentric in morphology, and the sex-chromosome mechanism is inferred to be a multiple system, being an X 1X2-X1X2 mechanism in the female, and an X1 X2-Y in the male. Expand
Karyological study of the red swamp crayfish and the Japanese lobster by air-drying method.
The diploid chromosome numbers and karyotypes of Pracambarus clarkii and Nephrops japonicus are described by an air-drying method and one subtelocentric pair of N.japonicus is remarkably large as compared with other pairs. Expand