Bitgood J J
Poult Sci. 1985 Dec;64(12):2234-8. doi: 10.3382/ps.0642234.
Genetic linkage tests were conducted using four Z-linked loci and three Z-linked chromosome rearrangements (interchanges). Z-linked recessive white skin (y) segregated independently from the Z-linked barring (B) and silver (S) loci. A map distance of 18.2 +/- 3.2 was found between y and the MN t(Z;1) interchange. A previous report had shown that B was located 22 map units from this interchange, therefore, because B and y were found not to show measurable recombination, the linear order is B-interchange-y. The MN t(Z;3) interchange was tested against S, and no recombinants were recovered in 217 backcross progeny, indicating very close genetic linkage. The NM 7659 t(Z;1) interchange was tested against the dermal melanin locus (id+) and independent assortment was noted. This supports other work that has shown that the S and id+ loci lie on opposite arms of the Z chromosome. Evidence is reviewed that supports the concept that S and the NM 7659 and MN t(Z;3) interchange break points are located on the short arm, while B, id+, y, and the MN t(Z;1) interchange break point are located on the long arm of the Z chromosome.
利用四个Z连锁基因座和三个Z连锁染色体重排（互换）进行了遗传连锁测试。Z连锁隐性白皮肤（y）与Z连锁横条（B）和银色（S）基因座独立分离。在y与MN t（Z；1）互换之间发现图距为18.2±3.2。先前的一份报告显示，B位于距此互换22个图距单位处，因此，由于发现B和y之间没有可测量的重组，线性顺序为B-互换-y。对MN t（Z；3）互换与S进行了测试，在217个回交后代中未发现重组体，表明遗传连锁非常紧密。对NM 7659 t（Z；1）互换与皮肤黑色素基因座（id+）进行了测试，并观察到独立分配。这支持了其他研究结果，即S和id+基因座位于Z染色体的相反臂上。有证据支持这样的概念，即S以及NM 7659和MN t（Z；3）互换断点位于短臂上，而B、id+、y和MN t（Z；1）互换断点位于Z染色体的长臂上。
