In the last ten years, additional genetic markers in the form of chromosome rearrangements have become available for use in expanding the genetic linkage map of the chicken. A series of studies that have been conducted by several laboratories have made it possible to identify the long and short arms of the nearly metacentric chicken Z chromosome. Breakpoints of several chromosome translocations have been mapped against selected phenotypic traits. Three new Z-linked recessive mutations are being mapped against known loci and chromosome rearrangement breakpoints. These mutations are pop-eye, assigned to the short arm, and recessive white skin and restricted ovulator, both of which appear to be located on the long arm. Further tests are needed to assign these loci to positions in the linear map, and some tests are underway. A tester line that will be recessive for several Z-linked mutations is being developed.

J. J Bitgood

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume X. Breeding programs for swine, poultry, and fish., , 289–292, 1986
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