FlyBase curator comment: this entry is used to capture phenotypic information when the particular allele (or allele combination) used by the author could not be determined but the context of the experiment suggests that the phenotype being described is some kind of loss of function.
ppk23unspecified mutant male flies exposed to other males that have been engineered to produce female pheromones (by expressing traScer\UAS.cFa under the control of Scer\GAL4OK72) do not show the increases in starvation resistance, triacylglycoeride (TAG) amount and lifespan that are seen when they are exposed to wild type males.
Homozygous D. melanogaster males show reduced courtship of conspecific D. melanogaster females.
Homozygous D. melanogaster males court conspecific D. melanogaster males. They do not court D. simulans, D. yakuba or D. virilis males.