Genes with a most recent common ancestor, and thus a shared evolutionary ancestry, are known as homologs. These genes appear either from gene duplication within an organism's genome, where they are known as <answer>paralogous genes</answer>, or are the result of divergence of the genes after a speciation event, where they are known as orthologous genes,:7.6 and often perform the same or similar functions in related organisms. It is often assumed that the functions of orthologous genes are more similar than those of <answer>paralogous genes</answer>, although the difference is minimal.
What are genes that occur from duplication within an organism's genome called?
paralogous genes