 ##  [Orthology](/orthology) 

  ##  [Orthology](https://natural.quantumdictionary.io/orthology-0) 

  
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**Natural &amp; Formal Sciences Dictionary**

 
Definition

A type of homology in which genes in different species are related by a speciation event and (typically) derive from the same ancestral gene, often retaining related ancestral function; used here in the strict evolutionary-genomic sense.