loss of function allele
Polytene chromosomes normal.
lethal - all die during embryonic stage
some die during embryonic stage
adult optic lobe
embryonic head epidermis | dorsal
embryonic optic lobe primordium
In mutant embryos, the dorsal medial head epidermis fails to develop as reflected by the presence of a continuous optic placode across the dorsal midline.
Embryos are ventralised.
zen4/Df(3R)Scr embryos show a similar pattern of defects as zen7/Df(3R)Scr embryos. The optic lobe is absent.
Mutant phenotype is suppressed by increasing the dpp+ gene dosage.
Fornili.
Moderate zen allele.
Moderate zen allele.