Abstract
1. Genetic variations of walking and flying ability of Drosophila melanogaster were examined by ‘connected-tube’ and ‘flight-tester’ apparatuses.
2. Males, on the average, walked faster and flied higher than females, and the correlation between sexes was significantly positive.
3. Walking abilities in four environments (Light and Shaked, Light and Rest, Dark and Rest, Dark and Shaked) correlated more or less positively with each other. The effect of shaking on the walking ability was different from the lighting conditions. Shaking generally activated the walking ability in the light but reduced in the dark.
4. Both walking and flying abilities have not correlated with each other or with other genetic traits such as viability, body weight and wing length.
5. Walking ability was controlled by additive polygenes whereas flying ability was controlled by mostly dominant genes.
