I've Got You Under My Skin by Egantx7

Question 1

What infamous hybrid came about as a way of increasing disease resistance by cross breading various western subspecies such as Apis mellifera ligustica from Italy and A. mellifera iberiensis from Spain with the heartier A. mellifera scutellata. The hybridization experiments took place in 1950s Brazil, and led to a few groups escaping quarantine.

Africanized (honey) bees ("Killer bees")