Abstract
THE possibility that irradiated cytoplasm may produce genetical effects in untreated chromosomes has been re-tested recently by Bonnier et al. 1, with inconclusive results, except for the case of gynandromorphs. The time interval between irradiation of the cytoplasm and entrance of the sperm would be expected to be a major factor in experiments of this nature. Recovery and photo-reactivation of irradiated cytoplasm have been observed by Henshaw2 and Harold et al. 3 for the egg of the sea-urchin. This suggests that a possible mutagenic power of irradiated cytoplasm may also be lost if the interval between irradiation and fertilization is too long.
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References
Bonnier, G., and Lüning, K. G., Hereditas, 37, 469 (1951). Bonnier, G., Brit. J. Rad., 25, 180 (1952). Bonnier, G., Lüning, K. G., and Arnberg, B., Hereditas, 38, 109 (1952).
Henshaw, P. S., Amer. J. Roent., 43, 907 (1940).
Harold, F. B., Robinson, J. C., and Loos, G. M., Proc. U.S. Nat. Acad. Sci., 36, 623 (1950).
Tazima, Y., Rep. Co-ord. Reserch Genet., 2, 153 (1951). Tazima, Y. (unpublished). Nakao, Y. (unpublished). Murati, K. (unpublished).
Tazima, Y., “Mosaicisms in the Silkworm” (in Japanese, Tokyo, 1947).
Hashimoto, H., Bull. Imp. Seric. Exp. Stat., 8, 455 (1934). Tazima, Y., Jap. J. Genet., 15, 3 (1939); “Mosaicisms in the Silkworm”.
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NAKAO, Y. Action of Irradiated Cytoplasm on Untreated Chromosomes of the Silkworm. Nature 172, 625–626 (1953). https://doi.org/10.1038/172625a0
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DOI: https://doi.org/10.1038/172625a0
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