i think you misstated dave's study...you said:
...the study you pointed to doesn't give any mention of "multiple drones of the same genetics".Mating with one drone, or multiple drones of the same genetics equates to a 50/50 chance of inheriting chalkbrood resistance.
i think that if there were 2 different drone sources, each with 50% of the drones carrying CR, that it wouldn't matter if a queen mated with one drone from each colony, or with 2 drones from the same hive.
...also, wrt Dave's paper....
??? how did he know a drone was on a mating flight?I chose 24 colonies
as the male (drone) sources, all of which were unrelated
to the maternal source and to each other. I obtained sexually
mature drones by capturing them at their hive entrances as they
returned from unsuccessful mating flights.
??? how did he know the drone was returning to the hive in which he was born?
??? given the above, how did he know they were unrelated to each other?