Whid-H109 heterozygotes show wild-type levels of survival when exposed to 0-8000 R of X-rays.
The wing discs of Whid-H109/+ mutant third instar larvae exhibit reduced levels of apoptosis in response to X-ray induced irradiation with 4000 rads compared to controls.
Hemizygotes die before hatching and possess an improperly formed cephalopharyngeal skeleton, all components are present but do not show their normal spatial relationship to each other.
Mutant males can be ranked based on the severity of terminalia rotation: Df(3L)H99 > Whid-H109 > Whid-A22 > Whid-A206 > Whid-A329 > Whid-H89. The ranking is roughly similar to the one for the degree to which the alleles disrupt embryonic head development.