The frequency pattern of dumpy mutations induced by X-rays in the successive stages of oocytes of Drosophila.

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概要

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• The frequency patterns of the different kinds of dumpy mutations induced by X-rays (1, 500 and 3, 000R) in the successive stages of oocyte development were investigated by transferring the inseminated females daily to fresh vials for 12 days. Under this transferring procedure, the first egg-laying period represents oocytes irradiated when they are at stage 14, and the subsequent ones represent progressively earlier stages of oocyte development at the time of irradiation.The results obtained indicate that (1) the overall yield of complete dumpy mutations recovered in the first six day egg-laying periods (1st-6th day) are relatively higher than that in the subsequent six day periods (7th-12th day), showing a response pattern with a higher mutation frequency in the early egg-laying periods and a lower frequency in the late egg-laying periods; (2) the frequency patterns for the exceptions of the ol and lv types and those of ov and olv types through the ampling periods are practically similar to those observed in the total dumpy mutations; (3) a somewhat peculiar frequency pattern, which seems to be variable by dose, is found in the yield of the o and v exceptions. At the exposure level of 1, 500R, no definite difference in response pattern for these exceptions is found, though a response pattern which is practically similar to that observed in the total dumpy mutations is found at the exposure level of 3, 000R.The foregoing findings seem to indicate that the different kinds of dumpy exceptions are affected at various degrees by the difference in the cell stages of oocyte. This may possibly suggest that these exceptions are different from each other in the nature of their mutations, that is to say, whether they are associated with chromosome breakage events or not.

• 日本遺伝学会の論文

著者

• MIYAMOTO TOMIO

  Zoological Laboratory, Faculty of Science, Hiroshima University

• NAKAO YOSHIO

  Zoological Laboratory, Faculty of Science, Hiroshima University

• MIYAMOTO TOMIO

  Zoological Labaratory, Faculty of Science, Hiroshima University

関連論文

• ショウジョウバエのdumpy座位におけるX線線量と誘発突然変異率との関係〔英文〕
• ショウジョウバエの精子形成過程におけるX線誘発dumpy突然変異の出現様相〔英文〕
• The frequency pattern of dumpy mutations induced by X-rays in the successive stages of oocytes of Drosophila.
• Storage effects on translocations and dominant lethals induced by ethyl methanesulfonate (EMS) in Drosophila melanogaster.

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