A geneticist was an expert in genetics.
Geneticists on Moab IV were able to screen out any congenital health problems before a child was conceived. (TNG: "The Masterpiece Society ")
The Bajoran Dekon Elig was a geneticist. (DS9: "Babel")
Some geneticists were of the opinion that Klingons developed a third lung in order to increase their stamina while fighting. (VOY: "Lineage")
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