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Volume 60, Issue 8
Displaying 1-9 of 9 articles from this issue
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Masahiro IMOTO, Hiroyuki YOSHIMURA, Shoichi KUSUMOTO, Tetsuo SHIBA1984 Volume 60 Issue 8 Pages 285-288
Published: 1984
Released on J-STAGE: October 10, 2006
JOURNAL FREE ACCESSDownload PDF (387K) -
A New Robertsonian Fission of the No. 6 Chromosome found in a Specimen collected from Aichi-ken, with special regard to the Bimodal Distribution of B-ChromosomesTosihide H. YOSIDA, Masayasu Y. WADA1984 Volume 60 Issue 8 Pages 289-292
Published: 1984
Released on J-STAGE: October 10, 2006
JOURNAL FREE ACCESSOne specimen of the Japanese raccoon dog (Nyctereutes procyonoides viverrinus) collected from Aichi-ken, Japan, has a new Robertsonian fission of the no. 6 chromosome. By the fission the basic chromosome number of this specimen is 2n=39. This specimen is also characterized by having one, two and three B-chromosomes in the somatic cells. Most of cells have two (52.4%) and three B's (45.9%). By the Robertsonian fission and B-chromosomes, this specimen is mosaic due to mainly two cell types with 41 (39+2Bs') and 42 chromosomes (39+3B's).View full abstractDownload PDF (487K) -
Robertsonian Fission of Three Chromosome Pairs, Nos. 5, 8, and 11, found in a Specimen collected from Kanagawa-ken, with regard to the Numerical Variation of B-ChromosomesTosihide H. YOSIDA, Masayasu Y. WADA1984 Volume 60 Issue 8 Pages 293-296
Published: 1984
Released on J-STAGE: October 10, 2006
JOURNAL FREE ACCESSA male Japanese raccoon dog (Nyctereutes procyonoides viverrinus) collected from Kanagawa-ken is remarkable for having the Robertsonian fission of three chromosomes, nos. 5, 8 and 11. By such a fission these chromosome pairs are heteromorphic in respect to two acrocentrics and one metacentric. The karyotype of this specimen is also characterized by having two to four B-chromosomes. Most cells have 3 B's (59.6%) and 4 B's (36.1%). By such a variation of B's, this specimen is to be mosaic consisting of mainly two cell types; 2n=44 chromosomes (39 autosomes+XY+3 B's) and 2n=45 (39 autosomes+XY+4 B's).View full abstractDownload PDF (495K) -
Distribution of B-Chromosomes in Four Youngs from One Litter collected in Saitama-kenTosihide H. YOSIDA, Masayasu Y. WADA1984 Volume 60 Issue 8 Pages 297-300
Published: 1984
Released on J-STAGE: October 10, 2006
JOURNAL FREE ACCESSKaryotypes and distribution of B-chromosomes in four youngs from one litter are examined. They have the same basic karyotype with 2n=38. The Robertsonian fission is not observed in these specimens. Among four specimens, two specimens, RD-8404 (_??_) and RD-8406 (_??_), have the modal number of 2 B's, but the other two, RD-8405 (_??_) and RD-8407 (_??_), show to have 3 B's. The somatic variation of the number of B's is observed in these four specimens, but is slightly different from each other. The difference of the number of B's in these specimens is suggested to be due to the random distribution of B's in meiosis of the parents.View full abstractDownload PDF (372K) -
Distribution of B-Chromosomes in 1, 372 Cells from 13 Specimens, with Special Note on the Frequency of the Robertsonian FissionTosihide H. YOSIDA, Masayasu Y. WADA1984 Volume 60 Issue 8 Pages 301-305
Published: 1984
Released on J-STAGE: October 10, 2006
JOURNAL FREE ACCESSDistribution of B-chromosomes and the frequency of specimens with the Robertsonian fission are observed in 13 Japanese raccoon dogs collected in different localities. Among 13 specimens, 2 B's and 3 B's are observed in 5 specimens, respectively, and the remaining 4 specimens have 4 B's. The specimens without B's have not been observed so far. Among these animals, 5 specimens have the Robertsonian fission; three in no. 8, one in no. 6 and the remaining one in nos. 5, 8 and 11. The somatic variation of B's is analysed in 1, 372 cells in total obtained from the 13 specimens. Cells with 2, 3 and 4 B's are observed more frequently, while the cells with 1, 5, 6, and 7 B's are extremely fewer. The cells without the B's and with more than the 8 B's have not been observed. These investigations suggest that the Japanese raccoon dogs with few B-chromosomes are preferentially selected in the natural population of Japan.View full abstractDownload PDF (597K) -
Makoto MUROFUSHI, Yoshiaki DEGUCHI, Tosihide H. YOSIDA1984 Volume 60 Issue 8 Pages 306-309
Published: 1984
Released on J-STAGE: October 10, 2006
JOURNAL FREE ACCESSThe diploid chromosome numbers and karyotypes of Pracambarus clarkii and Nephrops japonicus are described by an air-drying method. The diploid chromosome number of P. clarkii is one hundred and eighty-eight (2n=188) in both the male and the female, among which forty-two meta- and submetacentric and fifty-two subtelo- and acrocentric pairs are included. The diploid chromosome number of N. japonicus is one hundred and thirty-six (2n=136) in both the male and the female, among which forty-six meta- and submetacentric and twenty-two subtelo- and acrocentric pairs are included. One subtelocentric pair of N. japonicus is remarkably large as compared with other pairs. The large chromosome pair is not found in P. clakii.View full abstractDownload PDF (421K) -
Kenichi AOKI1984 Volume 60 Issue 8 Pages 310-313
Published: 1984
Released on J-STAGE: October 10, 2006
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Yoshikazu NAKAZATO, Yutaka YAMADA, Urara TOMITA, Akira OHGA1984 Volume 60 Issue 8 Pages 314-317
Published: 1984
Released on J-STAGE: October 10, 2006
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Masayoshi TACHIBANA, Seiichi KOMIYA, Chifuyu YAMADA, Masahiro SOKABE1984 Volume 60 Issue 8 Pages 318-321
Published: 1984
Released on J-STAGE: October 10, 2006
JOURNAL FREE ACCESSDownload PDF (405K)
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