Good video HP.
Genetics of honey bees is compounded by the fact the queens breeds with so many drones.
An example of what can go wrong: a queen breeds with 10 drones and one of the ten drones has genetics for mean or defensive behavior. Thus the queen produces a hive of 20,000 bees and out of that 20,000, there are 2,000 bees that are mean as conceived by one undesirable drone.
However, the entire hive gets labeled as defensive or mean.
Genetics of multiple drones can also work in our favor. What if one of the drones codes for hygienic, mite riddance behavior. Walla!!!
Genetics works in all directions, but can be skewed in favor of productive bees as shown in the video.