Abstract
Crosses of Neurospora crassa, segregating for the spore colour marker asco, were exposed at various stages prior to and during meiosis to a chelating agent, a paramagnetic salt and the classic inhibitor of DNA synthesis, 2′-deoxyadenosine, respectively. The responses of the crosses in terms of second division segregation of asco were studied. All three agents, when added at two different periods, 24–36 hours and about 120 hours after fertilization, respectively, caused significant decreases in recombination frequency. The first of the two responsive periods probably coincides rather well with the premeiotic interphase and the second one with pachytene. The striking similarities of the patterns of response after the three different treatments suggest that the same underlying cellular function is affected in all cases, i.e. DNA synthesis.
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