The relation of radiation sensitivity to pronuclear chromosome structure |
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Authors: | Norbert Israelewski |
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Affiliation: | 1. Lehrstuhl für Genetik der Ruhr-Universit?t Bochum, Postfach 102148, D-4630, Bochum, Federal Republic of Germany
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Abstract: | After treatment of mature spermatozoa of Phryne cincta egg mortality rates were determined and chromosomal mutation rates by examination of the polytene chromosomes of the F1 progeny.--A comparison of the results with similar studies made on Drosophila melanogaster yielded a two- to threefold higher sensitivity in Phryne cincta. Evaluation of data concerning DNA amounts, heterochromatin contents, distribution of breaks, repair capacities in two-break sites and oxygen concentrations in mature spermatozoa revealed no contradiction to the hypothesis that the greater sensitivity of Phryne cincta is mainly due to a high degree of spiralization of the paternal pronucleus chromosomes. |
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