Yes, alleles is a Scrabble word!
...and is worth 7 points in Scrabble, and 10 points in Words with Friends
alleles
Noun
1. (genetics) either of a pair (or series) of alternative forms of a gene that can occupy the same locus on a particular chromosome and that control the same character
What Scrabble words can I make with the letters in alleles?
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Words that can be created with an extra letter added to alleles:
B:sellable