Carefoot W C
Br Poult Sci. 1985 Jul;26(3):409-12. doi: 10.1080/00071668508416829.
An investigation was conducted among the progeny from crosses between Gold-Pencilled Hamburgh and Partridge Wyandotte bantams into the relationship between two plumage pattern phenotypes, pencilling and autosomal barring, both of which are arrangements of eumelanin expressed on a background of phaeomelanic pigmentation. A eumelanin restricting gene Db had previously been shown to be responsible for the barred phenotype when acting in conjunction with a pattern arranging gene Ab. The pencilled phenotype had been presumed to be caused by the presence of a pencilling gene Pg. The F2 generation consisted entirely of three phenotypes: barred, pencilled and intermediary, with presumed genotypes DB/Db, db+/db+ and Db/db+ respectively, indicating that Ab and Pg are one and the same gene, for which I propose the retention of the symbol Pg. The gene action of Db when homozygous is therefore to prevent curvature, so changing pencilling into barring.
对金铅笔汉堡鸡和鹧鸪怀恩多特矮脚鸡杂交后代进行了研究，以探究两种羽色图案表型——铅笔纹和常染色体横斑之间的关系，这两种表型都是真黑素在棕黑素色素沉着背景上的排列方式。先前已表明，真黑素限制基因Db与一个图案排列基因Ab共同作用时，负责产生横斑表型。铅笔纹表型被推测是由铅笔纹基因Pg的存在所致。F2代完全由三种表型组成：横斑、铅笔纹和中间型，推测基因型分别为DB/Db、db+/db+和Db/db+，这表明Ab和Pg是同一个基因，我建议保留符号Pg。因此，Db纯合时的基因作用是阻止弯曲，从而将铅笔纹变成横斑。
