loss of function allele
hypomorphic allele - genetic evidence
Polytene chromosomes normal.
lethal - all die during embryonic stage
some die during embryonic stage
adult optic lobe
embryonic head
Embryos are ventralised.
Head involution does not occur in zen5 hemizygotes. The optic lobe is absent.
Mutant phenotype is suppressed by increasing the dpp+ gene dosage.
Fornili.
Moderate zen allele.
Moderate zen allele.