That's a mutation of the reproductive system of the class Gender with male as the value, also known as a sex. Still a male, with their mutation event modifying

That's a mutation of the reproductive system of the class Gender with male as the value, also known as a sex. Still a male, with their mutation event modifying the state of their reproductive system into damaged, one that is different from the original state. That does not change the class but simply the value of a property within that class.