Imprecise excision, resulting in a large, uncharacterized deletion.
lethal | second instar larval stage (with EcRM554fs)
partially lethal - majority die | first instar larval stage (with EcRM554fs)
40% of EcR172/EcRM554fs mutants survive to the first instar larval stage, 40% survive to the second instar larval stage, while all larvae are dead before the third instar larval stage.
EcRM554fs
Selected as: F2 progeny with white eyes that cannot complement the EcRM554fs mutation for viability.