Imprecise excision of the P{wHy} element resulting in the deletion of 186bp downstream of the first ATG of Mnn1. Part of the 5' sequence of the P{wHy} element is retained, including the w+mC marker.
Mnn1Δ79 and Mnn1Δ46/Mnn1Δ79 males show a constant rate of early mortality in days 1-30. These flies also appear to be slightly more resistant to the herbicide paraquat, although this is in contrast to previous reports of other Mnn1 mutants showing increased sensitivity to paraquat.