I have seen 4 queens with a paralysed back right leg this year, all grafted from the same mother. The one in the video is not laying but others have flown and mated, producing fairly patchy brood which is hardly surprising.

I am speculating that this is a genetic defect caused by a gene from a single one of the drones the mother queen mated with as I have seen 4 queens like this out of about 60.

Could this be possible if the gene does not have a detrimental effect in the drone? Drones being haploid should not be carrying lethal genes.

http://www.youtube.com/watch?v=YxVslbbSjNo