This interesting image shows, the hive preparing to swarm. You can see fresh eggs (D) so, there must be a Queen in the colony, there is developing larvae (A) and yet there are 2 Queen cells (B). There are also drone cells (C).
On website Lauren replied: "...Your information is very accurate, except that unfertilized eggs develop into drones without any additional fertilization. This means that male bees (drones) have half the number of chromosomes that female bees (queens and workers) do, which leads to lots of interesting behaviors."