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SKIN COLOUR IN SOUTHERN BRAZILIAN POPULATIONS

G. AINSWORTH HARRISON, J. J. T. OWEN, FERNANDO JOSÉ DA ROCHA and F. M. SALZANO
Human Biology
Vol. 39, No. 1 (February, 1967), pp. 21-31
Stable URL: http://www.jstor.org/stable/41448819
Page Count: 11
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SKIN COLOUR IN SOUTHERN BRAZILIAN POPULATIONS
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Abstract

A study has been made with an EEL reflectance spectrophotometer of skin colour variation in a sample of 669 individuals drawn from the population of Porto Alegre, Brazil : a population which can fairly clearly be divided into Negro and White components. On the basis of three different scales of measurements, it is concluded from comparisons of the White and Negro components with various African samples, that between 40 and 50% of the skin colour genes in the Brazilian Negro are of European origin. These estimates of the degree of intermixture are in close agreement with those obtained from single gene marker systems. Comparisons of the observed distributions of skin colour in the Brazilian Negro samples with models based on different numbers of gene pairs, confirm earlier findings that only a few genes are responsible for the skin colour differences between Africans and Europeans.

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