The Japanese Journal of Genetics
Online ISSN : 1880-5787
Print ISSN : 0021-504X
ISSN-L : 0021-504X
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Volume 55, Issue 6
Displaying 1-3 of 3 articles from this issue
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  • THE DEGRADATION OF RIBOSOMAL RNA DURING THE DEVELOPMENTAL STAGES IN DROSOPHILA MELANOGASTER
    SHIGEMITSU TANO
    1980 Volume 55 Issue 6 Pages 417-425
    Published: 1980
    Released on J-STAGE: May 21, 2007
    DOIhttps://doi.org/10.1266/jjg.55.417
    JOURNAL FREE ACCESS
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    The specific changes in the degradation of ribosomal RNA of Drosophila melanogaster were analyzed during the developmental stages. Severe degradation of rRNA was observed in the homogenates of the Specific stages (72, 144, and 168h old larvae) during the larval development from the results of polyacrylamide gel electrophoresis without purification of rRNA. It was suggested that this degradation of rRNA was induced by endogenous RNase contained in the larvae.
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  • GENETIC DISSECTION OF EARLY DEVELOPMENTAL PHASES OF THE TESTIS AND THE OVARY IN DROSOPHILA MELANOGASTER
    YASUYOSHI NISHIDA
    1980 Volume 55 Issue 6 Pages 427-439
    Published: 1980
    Released on J-STAGE: May 21, 2007
    DOIhttps://doi.org/10.1266/jjg.55.427
    JOURNAL FREE ACCESS
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    A Drosophila melanogaster stock carrying an EMS-treated third chromosome (5A) over a balanced lethal chromosome (TM6) was analysed. Homozygous 5A males and females both had rudimentary gonads. Genetic analyses of the stock revealed that two mutations are present which are responsible for the gonadal dysgenesis; ms(3)m15A acting on the germ cells and producing the rudimentary testes and fs(3)f15A affecting the ovarian mesodermal cells and causing rudimentary ovaries. These mutations are located near the proximal heterochromatic region of the third chromosome. In addition, two more sterility mutations were found on the same chromosome; fs(3)f25A which produces maternal-effect embryonic lethality, and ms(3)m25A which blocks the maturation of spermatids. A second chromosomal gene, su(m15A), was identified which specifically suppresses the action of ms(3)m15A.
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  • MITOCHONDRIAL DNA POLYMERASE FROM CAULIFLOWER INFLORESCENCE
    HIROSUKE FUKASAWA, MEI-YIN CHOU
    1980 Volume 55 Issue 6 Pages 441-445
    Published: 1980
    Released on J-STAGE: May 21, 2007
    DOIhttps://doi.org/10.1266/jjg.55.441
    JOURNAL FREE ACCESS
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    DNA polymerase was isolated from the mitochondrial fraction of cauliflower inflorescence and characterized. The enzyme is clearly separable from the nuclear DNA polymerases by high salt elution on DEAE-cellulose column chromatography. Template-primer utilization, response to KCl and sensitivity to N-ethylmaleimide of the enzyme are similar to those of DNA polymerase of animal mitochondria.
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