hypomorphic allele - genetic evidence
lethal - all die before end of larval stage | recessive
some die during larval stage | recessive
Only 6.9% of hemizygotes survive to the third larval instar.
Mybel2507 has lethal | recessive | larval stage phenotype, suppressible by bon21B/bon[+]
80.8% of Mybel2507/Y ; bon21B/+ animals survive to the third larval instar.