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. 2012 Oct 24;110(3):239–246. doi: 10.1038/hdy.2012.73

Table 2. Association between sex and genotype at the putative ZW locus (chromosome 5 at 26.3 cM).

  ZZ ZW WW
Male 57% 46% 0
  (n=52) (n=82)  
Female 43% 54% 100%
  (n=40) (n=95) (n=69)

All homozygous ‘W' individuals are female, while heterozygotes were slightly skewed towards females and homozygous ‘Z' individuals were slightly skewed towards males, due to additional loci and their interactions.