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A Swiss Family Showing Independent Segregation of the Lutheran and Swann Genes

Abstract. A family is reported in which the parents' mating is of the ‘double back‐cross’ type with respect to the Sw, Lu and Se genes. The inheritance of these genes in the children shows, with reference to a possible linkage between Sw and the two other loci, four non‐recombinants and three recombinants (or vice versa). The inheritance of the Lu and Se genes shows the well‐known linkage between these two loci, with no instance of recombination. It is concluded that there is no evidence for close linkage between Sw and Lu‐Se, and that the suggestion of a Sw‐Lu linkage found in a family studied previously was due to chance.