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- W2089476944 abstract "Abstract This paper is concerned with mutation spectra induced by γ- or X-rays in postmeiotic germ cells of male silkworm with special regard to the change in frequency pattern of mosaic (fractional) and whole-body (complete) mutants. When silkworm spermatozoa are irradiated with γ-rays, the frequency of whole-body mutants increases linearly with increasing dose, whereas that of mosaics increases exponentially. The latter relation is in striking contrast to that observed in Drosophila, where the incidence of mosaics has been known to reach a plateau at a relatively low dose level. Several possibilities are considered for the interpretation of the difference. Mosaics produced after irradiation of silkworm spermatozoa appear to form a mixed class of at least two types, single-helix type and chromosome-aberration type. The proportion of both may vary depending on the irradiated dose. The incidence of mosaics in comparison to that of whole-body mutants varies considerably with the progress of spermatogenesis. On a per R-basis, spermatogonia yield the lowest frequency of mosaics; the frequencies of both complete and mosaic mutations increase sharply through meiotic prophase up to V-4.5 (fifth instar larvae, day 4.5). Until this stage relatively more completes than fractionals are produced. Around V-4.5 the ratio of mosaics to completes reaches unity. From this stage onward, during spermiogenesis, relatively more mosaics than completes are produced, although their absolute frequencies of induction are far lower than in V-4.5. This observation may be interpreted as resulting from a greater capacity for repair of premutational damage leading to mosaic mutations in the early than in the late stages of spermiogenesis." @default.
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- W2089476944 title "Frequency pattern of mosaic and whole-body mutants induced by ionizing radiations in post-meiotic cells of the male silkworm" @default.
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- W2089476944 doi "https://doi.org/10.1016/0027-5107(69)90152-3" @default.
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