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Fig. 1 | Evolution: Education and Outreach

Fig. 1

From: The Causes and Consequences of Color Vision

Fig. 1

Schematic of the genetic basis of color vision in humans: a Color blindness is a recessive sex-linked trait found on the X chromosome. Sex-linked genes located on X chromosome: plus sign normal vision (dominant), o color blindness (recessive); b Sex-linked genes located on X chromosome: single plus sign LWS allele SER (557 nm), double plus sign LWS allele ALA (552 nm). The difference in the absorption frequency between the SER and ALA alleles allows females with both alleles (heterozygotes) to see more colors than males and females with trichromatic color vision (Deeb and Motulsky 1996)

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