"Orthologous genes" refers to genes found in different species that are derived from a common ancestral gene. These genes usually have similar functions in their respective species, despite potential differences in structure or other characteristics.
Full definition
Inferring nonneutral evolution from human - chimp -
mouse orthologous gene trios Clark, A. G., S. Glanowski, R. Nielsen, P. D. Thomas et al. 2003.
Co-developed a method for determining
orthologous genes in prokaryotes that can differentiate close paralogs using gene neighborhood context.
Positive selection in the human genome inferred from human — chimp — mouse
orthologous gene alignments Clark, A. G., S. Glanowski, R. Nielsen, P. Thomas et al. 2003.
Three data sets of
orthologous genes from eighteen genomes were aligned using default parameters using CLUSTALW53 and poorly aligned regions were excluded using Gblocks54.