McGibbon W H
J Hered. 1981 Mar-Apr;72(2):139-40. doi: 10.1093/oxfordjournals.jhered.a109450.
A 6-week-old pullet was noted with white shanks and beak from a strain of SC White Leghorns, pedigree-bred as a closed flock since 1948. Mating of the mutant to males with yellow skin produced only yellow skinned progeny. The F2 progeny consisted of equal numbers of yellow or white shanked pullets and yellow shanked sons. This distribution indicates that the new trait is due to a mutation on the Z chromosome. The symbol y is suggested for the new allele. Tests for linkage with late feathering K and with id revealed that the new locus is not closely linked with either. The white shank color trait is quite accurately identified in the newly hatched chick.
一只6周龄的小母鸡来自自1948年起作为封闭鸡群进行系谱培育的SC白来航鸡品系，其胫部和喙为白色。该突变体与黄皮肤雄性交配仅产生黄皮肤后代。F2后代由数量相等的黄胫或白胫小母鸡以及黄胫公鸡组成。这种分布表明新性状是由Z染色体上的突变引起的。建议用符号y表示新等位基因。与迟羽K和id的连锁测试表明，新位点与两者均无紧密连锁。新孵出的雏鸡中白胫颜色性状能被相当准确地识别。
