Abstract
Dominant lethal mutations induced by γ-radiation were measured in stage-7 and stage-14 oocytes of Musca domestica. At both stages the data are consistent with the multi-hit theory on radiation induction of dominant lethals. This conclusion is supported by fractionation experiments which indicate that both] S7 and S14 oocytes are capable of repairing, in defferent periods of time, a similar amount of dominant lethal damage.
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