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Test for linkage between the eumelanin restrictor (Db) and the eumelanin extension (Ml) genes in the domestic fowl.

A mating was made between a Gold-Pencilled Hamburgh bantam male and a double-laced bantam female to produce a double heterozygote of the linked eumelanin restrictor (Db) and eumelanin extension (Ml) genes. A male so produced was mated to a pen of Partridge Wyandotte bantam females, thus providing a backcross to the double recessive. Three crossovers occurred among the 31 female progeny suggesting linkage of approximately 10 units between Db and Ml. The pattern gene Pg has previously been shown to be linked with both Db and Ml by approximately 17 and 10 units respectively. The locus of Ml appears therefore to lie between the loci of Db and Pg.