| Project/Area Number |
61540461
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
遺伝学
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| Research Institution | Ochnomizu University |
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Principal Investigator |
CHIGUSA Sadao Ishiwa Ochanomizu University Department of Biology, 理学部, 教授 (20017205)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUURA Etsuko T. Ochanomizu University Department of Biology, 理学部, 助手 (00111691)
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| Project Period (FY) |
1986 – 1987
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| Project Status |
Completed (Fiscal Year 1987)
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| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1987: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1986: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | Hybrid dysgenesis / P-M system / P cytotype determination / 不完全型P因子 / 転位酵素 / ハイブリッド・ディスジェネシス / 小笠原父島 / P因子抑制機構 / 可動因子 / Pサイトタイプ,リプレッサー |
|---|
| Research Abstract |
Many inbred and isofemale lines derived from wild populations of Drosophila melanogaster were tested for gonadal dysgenic sterility, male recombination and sn<omega> secondary mutation. Among them, we have found strains whose dysgenic offspring show negligible sterility, and undetectable male recombination and sn<^(omega) mutation. They can be considered to be neutral strains in the strict sense. Such neutral strains appear to carry only defective P elements in their genomes. Taking the observations of Karess & Rubin (1984) into account, it is suggested that some defective P elements retain the function necessary for P cytotype. Cytotype determination mechanisms are discussed.
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