Why only one per hive queen?

When the cold winter has passed, spring came, the queen of the species of bumblebees, he built one of their own ... I then lay eggs in it, raising a baby bees. At this stage, no matter the job or raising the next generation, things are due to complete his queen.

Even the queen bee that was born and raised there so all bees, but the queen has released a special substance to quell the sexual maturity, the females of the bees, to turn them into bee workers. After his life was the first young adult, they can receive the extra work and care for young bees, queen moved to the spawning period. Over time a growing hive, bees and more.

So that the hive has only one queen because the bees are born after the queen. But there are some species of bees in the nest and survive a few queens. The queen is a "queen", forming a great "family" in a beehive. But the bee family does not allow any mistakes, so the queen can produce a special quality to distinguish it from other clans, but that's what special qualities it so far it has not been explored to detect be.