The z locus

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The z locus
Homozygous gazzi (z//z)
Homozygous gazzi (z//z).
Mutation type Colour modifier
Alleles Gazzi, recessive white, wild type.

The z locus is the position of a gene on a chromosome with three known alleles: gazzi, recessive white and wild type. It is possible that other pied expressions and perhaps pencil are also alleles at this locus.