Study of high-spin bands in the A\approx 100 mass region revealed that signature inversion systematically occurs in the {\pi }g_9/2{\nu }h_11/2 bands and in the three-quasiparticle bands containing this configuration, establishing here a new region of signature inversion. The behaviour of the inversion spin in the {\pi }g_9/2{\nu }h_11/2 bands can qualitatively be understood as a competition between the Coriolis and the proton--neutron interaction, as it was proposed earlier for the analogous A\approx 160 region, if we take the variation of the moment of inertia into account.

PACS numbers: 21.10.Re, 23.20.Lv, 21.60.Ev, 27.60.+j