Rare genetic conditions among the Gaingang Indians

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Abstract
Summary: 1. The total frequency of colour blindness among 245 Caingang Indians and Mestizos males is 4–49 %. But there exists variation of this frequency in the populations sampled.2. Several pedigrees are given of kindreds in which some members present Polydactyly or albinism. The high frequency of this last condition in one population is stressed.3. A general discussion of the data (which appeared in all articles of this series) is included. Examples of the possible influence of gene flow, genetic drift and natural selection in determining the frequencies of some genes are given.4. The four populations studied can be grouped into two main evolutive complexes.This work has been supported in part by grants from the Rockefeller Foundation and Comissao de Pesquisas of the University of Rio Grande do Sul. The technical assistance of Mr Girley V. Simoes is gratefully acknowledged.