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802 bytes added, 12:32, 10 May 2016
A colony with a purebred queen MEANING ALSO "PURE_MATED"? will always produce purebred virgin queens. The drones from this queen will also always be purebred. In other words, the drone is a genetic copy of its mother and has no genes from the father at all. The signs of cross-breeding show in the worker bees who have both the maternal genes from the queen and the paternal genes from drones that represent some other subspecies.
Besides resulting in the loss of the potentially unique Nordic Brown bee genotypes, cross-breeding is the main cause for the unfavorable properties of impure ''A. m. mellifera'' bees. The colonies behave aggressively and they have a high swarming tendency. For this reason, the beekeeper has to avoid cross-breeding and ensure the queens’ pure origin and mating.
To avoid cross-breeding: