Homozygous males die as first instar larvae while 86% of homozygous females eclose (all homozygous females survive at least to the second larval instar stage). Most homozygous females appear morphologically normal and fertile, although a small number have a rough eye phenotype. The presence of a Y chromosome in bonS043420/bonS043420 females (XXY animals) results in 100% lethality, while the absence of a Y chromosome in bonS043420/bonS043420 males (XO animals) rescues the lethality seen in XY bonS043420/bonS043420 males.
bonS043420 has lethal | recessive | male limited | first instar larval stage phenotype, non-suppressible by Sxlf1
The lethality of bonS043420 homozygous males is not rescued if they are also carrying Sxlf1; almost no escapers are seen. XX tra21/tra2B ; bonS043420/bonS043420 animals, that are genetically female (XX) but phenotypically male are viable.
bonS043420 fails to complement bonS024108, bon21B and Df(3R)H81 with respect to male lethality while it only partially fails to complement with respect to female lethality.