title: The incidence of colour-blindness among the tribal populations of Andhra Pradesh.
abstract: Among 126 Valmiki, 128 Bagatha, 129 Konda Dora and 73 Samanta tribals of Andhra Pradesh, the incidence of red-green colour-blindness in the males ranges from zero to 2.27 per cent. Samanta males exhibit no colour-blindness. In the females, only Konda Doras exhibit a frequency of 2.44 per cent of the trait. Comparison of the present data with the other available tribal and non-tribal data of Andhra Pradesh shows that our results fall well in the range for other data. Post's (1962) hypothesis of relaxation of selection against colour-blindness is also supported by our Andhra Pradesh data.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D003117:Color Vision Defects / Q000453:epidemiology*; D005260:Female; D006801:Humans; D007194:India; D008297:Male; D008875:Middle Aged; D012641:Selection, Genetic; D012737:Sex Factors