The orientation and evolution based on the unified scheme posit that blazar subsamples and radio galaxies (RGs) represent increasingly misaligned populations of active galactic nuclei (AGNs). Using compiled radio, X-ray and γ-ray data of the Fermi Large Area Telescope (Fermi-LAT) catalogue of 397 blazars and 110 radio galaxies, we computed the viewing angles and γ-ray core-dominance parameter, beamed and unbeamed γ-ray emissions of RGs in order to study the consequences of orientation and relativistic beaming effects on γ-ray properties of RGs, BLs and FSRQs. Our results show sequence in distributions of core-dominance parameters (X-ray, RX and γ-ray, Rγ) from RGs at low values, largest viewing angles to FSRQs at high values through the BLs subsets with the least angles, which is suggestive of evolutionary sequence. The difference in log RX and log Rγ is significantly larger for FSRQs and BLs than for RGs, as is expected in the evolutionary scheme. A two-sample Wilcoxon rank-sum and Kolmogorov-Smirnov tests carried out on our data suggest that the probabilities of the distribution of RX and Rγ of RGs and blazar types to come from the same parent distribution are pWRS ∼ 0 and pK−S < 10-4 which shows stronger beaming effects in blazars than in RGs. There is a significant correlation (r > 0.60) between log Rr - log LX for the combined sample types. Furthermore, a significant anti-correlation (r ∼ -0.80) exists in the log Rγ - log Lγ,un which is indicative of evolutionary sequence via a relativistic beaming model. These results imply that the evolutionary track of jetted AGNs is RGs – BLs – FSRQs