Abstract
The pattern of response of chiasma frequency to X-irradiation has been studied in germ line cells of male imagines of Schistocerca gregaria. A correlation has been established between the observed changes in chiasma frequency of the L and M type bivalents and the time in the meiotic cycle at which the treatment is given. Two radio-sensitive periods have been identified in meiosis itself. At one (meiotic DNA synthesis) X-irradiation produces a decrease in chiasma frequency while at the other (leptotene-early zygotene) the treatment leads to an increase in chiasma frequency. Small bivalents however do not respond to treatment and form a single chiasma under all conditions.
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Westerman, M. The effect of X-irradiation on male meiosis in Schistocerca gregaria (Forskål). Chromosoma 22, 401–416 (1967). https://doi.org/10.1007/BF00286545
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DOI: https://doi.org/10.1007/BF00286545