ZW system
English
![](../I/Avian_sex_determination.jpg.webp)
ZW sex determination in birds (as exemplified by chickens)
Proper noun
- (biology) A system for characterizing the sex of certain animals, such as butterflies and Komodo dragons, in which males have two of the same kind of sex cell (ZZ) and females have two distinct sex cells (ZW).
Alternative forms
Further reading
ZW sex-determination system on Wikipedia.Wikipedia
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