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Table 1 Sex reversal

From: Molecular patterns of sex determination in the animal kingdom: a comparative study of the biology of reproduction

  Female-producing temperatures Male-producing temperatures
XX (ZW) Female (in accordance with genotype) Female OR male (in discordance with genotype)
XY (ZZ) Male OR female (in discordance with genotype) Female (in accordance with genotype)
  1. The combination of genotypic and temperature-dependent sex determination allows a phenomenon known as sex reversal, where the phenotypic sex does not always agree with the genotypic directions.