orthologous
(adjective)
 having been separated by a speciation event
Examples of orthologous in the following topics:
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Constructing an Animal Phylogenetic Tree- Interestingly, 99% of the genes in humans and mice are detectably orthologous, and 50% of our genes are orthologous with those of yeast.
- The hemoglobin B genes in humans and in mice are orthologous.
 
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Gene Duplications and Divergence- Both orthologous genes (resulting from a speciation event) and paralogous genes (resulting from gene duplication within a population) can be said to display divergent evolution.