Summary
Incidence of colourblindness among 1501 (945 males and 656 females) persons belonging to four nomadic Mendelian isolates, the Nandiwallas of Maharashtra, India, has been reported. Out of the four groups, three lacked the gene for colourblindness, while in one group the incidence was rather low (0·3 per cent). Our findings support the differential selection hypothesis for this loci of Post (1962) and Pickford (1963). 110 families with 334 children were examined for the inheritance of this trait. All matings except one were of the type normal × normal and produced all normal children; the one family of the type father colourblind × normal mother, also had all the six children with normal colour vision. The implications of the loss of the colourblind gene has been discussed in the light of nomadic way of the Nandiwallas, and also of their small effective population sizes.
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Dutta, P C. 1966. A review of the inherited defective colour vision variability and selection relaxation among Indians. Acta Genet, Basel, 16, 327–339.
Hakim, S M. 1971. Blood and serum groups and other genetical characters of some endogamous muslim groups. Unpublished Ph.D. thesis, Bombay University.
Ishihara, S. 1968. Tests for Colour-blindness:Kanehara Shuppan Co., Ltd., Tokyo, Japan.
Malhotra, K C. 1967. The incidence of inherited defects of colour-vision in eight endo-gamous groups of Maharashtrian Brahmins. A Ge Me Ge (Rome), 16, 417–421.
Malhotra, K C. 1972. Nandiwallas: Preliminary observations on a nomadic caste in Maharashtra. Indian Statistical Institute, Technical Report series, No. 14/72, 1–27.
Malhotra, K C. 1973a. Pattern of nomadism. An example of social control mechanism and ecological pressures. (In Press.)
Malhotra, K C. 1973b. Incidence and inheritance of ear lobe attachment among 4 nomadic groups. Am J Phys Anthrop. (In Press.)
Malhotra, K G. Rate, S L, and Mutalik, G S. 1973. The genetic composition and structure of a nomadic caste-cluster in Maharashtra. (In Press.)
Malhotra, K C. Bhanu, B V. Fulmali, P M. Mutalik, G S, and Kate, S L. 1974. Finger dermatoglyphics among 4 Mendelian Isolates—an example of genetic drift-and founder effect. Proc 1st Ann Conf Ind Soc Human Genet, 12. (Abstract.)
Pigkford, R W. 1963. Natural selection and colourblindness. The Eugenics Review, 55, 97–101.
Post, R H. 1962. Population differences in red and green colour vision deficiency: Review and a query on selection relaxation. Eugenics Quarterly, 9, 131–146.
Salzano, F M, and Freire-Maia, N. 1970. Problems in Human Biology. Wayne State University Press, Detroit.
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Malhotra, K., Mutalik, G., Bhanu, B. et al. Incidence of colourblindness among four endogamous nomadic groups: an example of natural selection. Heredity 32, 145–149 (1974). https://doi.org/10.1038/hdy.1974.17
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DOI: https://doi.org/10.1038/hdy.1974.17