is this pure almond extract?

The Ingredients say: Water, Alcohol, and Bitter Almond Oil..If you look at a pure Vanilla Extract bottle it say's Vanilla Bean Extractives as the first item then in water, Alcohol and then sugar..It doesn't say anywhere on my bottle that's pure or imitation. So I'd go with NOT pure..Especially since the first ingredient is water..Hope that helps:-)

Is alcohol from genetically modified corn?

http://rodellekitchen.com/other-resources/rodelle-commercial-products I would suggest using this link and asking the company thru their email questions.... I like your question and would like to know the answer also👏

Does the cap have a dropper, how do you get just a few drops?

no dropper. You'll just have to pour a few drops into a spoon or the cap if you're afraid of over pouring. I just pour directly into my batters since most recipes call for at least 1 teaspoon.