Abstract
By using a dual-purpose stock it was possible to study the frequency of induced XO males and induced non-disjunction between the paternal X and Y chromosomes in Drosophila after 0 to 1 and 3 to 4 day old y/sup 16/; sc/ssup 8/Y males were irradiated (1100 r) and mated to virgin y w sn females in successive mating periods. The first mating period was delimited to 0 to 4 hours after irradiation but from the 4th day and on each mating period consisted of 24 hours. lt is shown that irradiation of Drosophila males causes non-disjunction between the paternal X and Y chromosomes. Hence, the occurrence of an increase in the frequency of non-disjunction in sperm ejaculated during a limited period after irradiation must be taken as an indication that those spermatozoa were in meiosis at the time of treatment. Factors which may influence this cell stage/ sensitivity relationship are discussed.
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