“Colorblindness” distribution in Britain, France, and Japan: A review, with notes on selection relaxation

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Abstract
The geographical distribution of estimates of rates of sex-linked color vision defects are presented for subdivisions of Great Britain, France and Japan, among males, pooling deuterans with protans. Certain aspects of the distributions are indicated with reference to the length of time deemed to have elapsed since the population relinguished hunting culture-habitats. The positive association in these countries, between "colorblindness" and such elapsed time is considered as evidence for the relaxation hypothesis.