The presented investigations of the magnetotransport measurements of Bi wires complement the series of recently published experimental results on bismuth nanowires in the deferent experimental configurations of magnetic field respective to the crystal orientation [1,2,3]. Measurements of the transverse magnetothermopower and magnetoresistance in single bismuth wires are performed at 80 K. Appearance of the asymmetry in the magnetothermopower defined as Umkher effect is observed. The investigations is focused on the manifestation of the Umkehr effect in the thermopower under the condition of the Electronic Topological Transition of the Fermi surface at the application of a directed deformation along bisectrix axis. Study of the magnetotransport properties under uniaxial strain revealed a reorganization of the band structure followed by the changes in the anisotropy of the Fermi surface at high strain values. A moderate applied stress leads to a decrease in the magnitude of the Umkehr effect in the thermopower up to the disappearance of the effect along one of the principal crystallographic axes. The observed behavior of the magnetothermopower and magnetoresistance is explained in the framework of the phenomenological theory of transport phenomena in Bi.