Approximately 64% of homozygous pdfrP2 mutants display rhythmic locomotion.
Approximately 83% of heterozygous pdfrP2/+ mutants display rhythmic locomotion.
pdfrP2 mutants can entrain to a 12:12 LD regimen.
Increased arrhythmicity is observed in pdfrP2 homozygotes.
pdfrP2 homozygous flies display normal geotatic responses.