Deletion mutation.
fertile
viable
Homozygotes of mus815.1 are viable, fertile, and show little, if any, hypersensitivity to the chemical mutagen methyl methanesolfonate.
mus815.1 has viable phenotype, suppressible by BlmD2
BlmD2, mus815.1, spn-A1 has viable phenotype
The double mutant of mus815.1 and mus309D2 is lethal, even though both mutations are viable individually. Most of the double mutants survive until the late larval stages, but die during pupation.
The triple mutant of mus815.1, mus309D2 and spn-A1 is lethal.