ZW sex-determination system
The zw sex-determination system is a way that some animals figure out if they are going to be a boy or a girl. In this system, it's the girls that have a big letter "Z" and a little letter "w". The boys, on the other hand, have two little letters "w".
Think of it like a secret code. When an animal is born, it has its own secret code that tells its body if it should grow up to be a boy or a girl. If the code has a big "Z", then their body gets the message to grow up to be a girl. But if the code only has little "w's", then their body gets the message to grow up to be a boy.
It's like having a magic spell that tells your body how to grow and develop. And this spell is written in the secret code of zw!
Think of it like a secret code. When an animal is born, it has its own secret code that tells its body if it should grow up to be a boy or a girl. If the code has a big "Z", then their body gets the message to grow up to be a girl. But if the code only has little "w's", then their body gets the message to grow up to be a boy.
It's like having a magic spell that tells your body how to grow and develop. And this spell is written in the secret code of zw!