1 - 10 %
||Soskine M, Tawfik DS. Mutational effects and the evolution of new protein functions. Nat Rev Genet. 2010 Aug11(8):572-82. doi: 10.1038/nrg2808. p.577 right column bottom paragraphPubMed ID20634811
||Lynch, M. Genomics. Gene duplication and evolution. Science 297, 945–947 (2002).PubMed ID12169715
||"Divergence can occur through duplication
of the ancestral gene to give two related genes, or
‘paralogues’ (genA and genB FIG. 3). Duplication is a very
frequent event. This is apparent in a variety of eukaryotic
genomes in which 1–10% of genes seem to coexist with
their nearly identical duplicates (primary source) and by the high variability
of gene copy number between individual genomes (refs 59,60).
The duplicated segments span from several bases up
to whole genomes."