Gaunt,
Yautja,
16 years ago
True an alien queen would need anouther genotype to create pretorians but not queens.
You see queens don't produce other queens as they need to be dominant in the Hive, So they create drones, pratorians ect to stay dominate in the Hive and when a queen dies drones and pratorians fight to be dominate and then evolve into a queen.
So there are different types of aliens but they all have the same genetics enabling them to evolve and keep the Hive in order and thriving.
Also aliens do need to eat, You see them eat in the movies and if you think about it facehuggers look for host as quickly as they can as they can't eat and are running on the energy they have in them (facehugger gets energy from egg) and when they run out of energy they die, So they need to get a host to feed on and develop into a chestburster.