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Nucleotide sequences of the human X-linked red and green pigment genes were compared, and the number of silent substitutions per site (KSc) between these genes was analysed in comparison with the corresponding values of primate genes. Taking the retarded mutation rate of X-linked genes into consideration (Miyata et al., 1987), the red and green pigment genes were shown to have undergone gene conversion at around the time of separation of African apes and orangutan. Thus the recent gene conversion and retarded mutation rate in these X-linked genes are probably responsible for the strong sequence similarity between these genes, which is likely to facilitate the occurrence of red-green color blindness in the human population. It was also shown that the red pigment gene evolved about five times more rapidly than the green pigment gene since the latest gene conversion.

Recent gene conversion between genes encoding human red and green visual pigments.