First, at birth, the doctors will announce the gender(male or female). In some verses, you can pay to have a test done to determine whether the baby is an Alpha, Beta, or Omega. In others, you just have to wait until they are about 12-24 years old to find this out. So in a way, you have two genders. The male/female gender and the Alpha,Beta,Omega gender.
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Omegaverse 101
RandomWant to know what ABO or in other words Alpha, Beta, and Omega well you come to the right place! ⚠Warning⚠: Kinda Gross topic in some placesss