Pencilled and double‐laced plumage pattern phenotypes in the domestic fowl

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Abstract
1. An investigation was conducted among the progeny from crosses between Partridge Wyandotte and Indian Game bantams into the relationship between two plumage pattern phenotypes, pencilling and double lacing. 2. The F2 generation consisted of 5 phenotypes, three of which could be attributed to the effect of Pg in the absence of Ml. The other two phenotypes were double lacing and an intermediary between double lacing and pencilling, with presumed genotypes Ml/Ml and Ml/ml+ respectively, indicating that Pg and Lg are one and the same gene for which I retain the symbol Pg. 3. The action of Ml when homozygous is therefore to both add an outer lace and increase the width of the inner rings of eumelanin, so changing pencilling into double lacing.