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I was wondering how a female generated male genetic data. Bird sex chromosomes are fuzzier than I expected. https://genetics.thetech.org/original_news/news115 h

• gus_massa 5y ago
  It now very fuzzy. https://en.wikipedia.org/wiki/ZW_sex-determination_system https://en.wikipedia.org/wiki/ZW_sex-determination_system Simplifying, they have the ZW system where the ZZ are males and the ZW are females. (As in the mammalian cases, there are some exceptions and cases where the number of genes is different from 2.) The article you posted discuss too much about how the ZZ or ZW determines the sex, and IIUC it's still not clear if the W induce the femaleness or the double Z induces maleness or what is happening, but the main idea that distinguish the ZW system and the XY system is simple.