title: Natural selection and colour blindness: fresh data on Indian castes.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D003117:Color Vision Defects / Q000453:epidemiology / Q000235:genetics*; D005787:Gene Frequency; D006801:Humans; D007194:India; D008297:Male; D008875:Middle Aged; D012923:Social Class