Principles of Genetics and Breeding

4.1.7.2 ZZ♂ :WZ♀ – system

• To avoid confusion XY system is omitted.
• ZZ male (homogametic), WZ females (heterogametic).
• This system is reported in fishes such as T. aurea, T. hornorum, Gambusia affinis (mosquito fish), Mud skipper (Boleophthalmus boddaerti), Aplocheilus panchax, European eel (Anguilla anguilla), Japanese eel (A. japonica), freshwater prawn (Macrobrachium rosenbergii).