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.
The mitochondria in the indirect flight skeletal muscle of 7-day old homozygotes appear larger than normal. They also show abnormal morphology, with regions of striking patterning of abnormal cristae.