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Ken and Barbie - so named because mutations in the drosophila genes leads to the absence of external genitalia - just like the plastic dolls.
Groucho - this is where a mutation produces extra bristles around the eye and it reminded someone of Groucho Marx's bristling eyebrows.
Dumpy - so called because the mutation produces short dumpy flies.
Amontillado - the name comes from an Edgar Allan Poe story 'The Cask of Amontillado' where a man is lured into a cellar and walled in alive. The mutant gene prevents drosophila larvae from vigorously shaking their heads to get out of their shell, and this reminded the discoverer of the Poe story.
Naked - the normal pattern of alternating bands of naked cuticle with bands of denticles is disrupted so that naked larval mutants do not possess denticle belts.
Hedgehog - instead of having stripes of spiky appendages the mutant larva have denticles all over the larval cuticles. Thus, resembling hedgehog spines.
Cheap Date - there is a gene involved in ethanol tolerance and when it was knocked out the flies had poor ethanol tolerance and behaved as if they were drunk.