hypomorphic allele - genetic evidence
embryonic/first instar larval cuticle
larval head | embryonic stage
ventral denticle belt
Embryos lacking maternal and zygotic Med function (Med1/Med25 embryos derived from females with homozygous Med1 germ line clones) show loss of dorsal tissue, expansion of the lateral denticle bands into dorsal regions and severe head defects.
Med1