lethal - all die before end of pupal stage | recessive
some die during pupal stage | recessive
Those males and females that eclose and mate appear normal and are fertile.
Most flies exhibit a pupal lethal phase like intro12 and intro13.
intro12
intro13
Viability of heterozygotes with intro12 or intro13 is low (5% or less).
Schalet.
Arose in: mei-9 stock.